diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvg.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvg.java
index 0b4652b305741..5265d5bcad660 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvg.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvg.java
@@ -23,9 +23,9 @@
 
 import java.util.List;
 
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.unsignedLongToDouble;
 import static org.elasticsearch.xpack.esql.type.EsqlDataTypes.isRepresentable;
 import static org.elasticsearch.xpack.ql.expression.TypeResolutions.isType;
-import static org.elasticsearch.xpack.ql.util.NumericUtils.unsignedLongToDouble;
 
 /**
  * Reduce a multivalued field to a single valued field containing the average value.
diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvMedian.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvMedian.java
index 7c3cb2c1c2d1d..8f65d15134cfa 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvMedian.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvMedian.java
@@ -26,10 +26,10 @@
 import java.util.Arrays;
 import java.util.List;
 
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.bigIntegerToUnsignedLong;
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.unsignedLongToBigInteger;
 import static org.elasticsearch.xpack.esql.type.EsqlDataTypes.isRepresentable;
 import static org.elasticsearch.xpack.ql.expression.TypeResolutions.isType;
-import static org.elasticsearch.xpack.ql.util.NumericUtils.asLongUnsigned;
-import static org.elasticsearch.xpack.ql.util.NumericUtils.unsignedLongAsBigInteger;
 
 /**
  * Reduce a multivalued field to a single valued field containing the average value.
@@ -156,9 +156,9 @@ static long finishUnsignedLong(Longs longs) {
         Arrays.sort(longs.values, 0, longs.count);
         int middle = longs.count / 2;
         longs.count = 0;
-        BigInteger a = unsignedLongAsBigInteger(longs.values[middle - 1]);
-        BigInteger b = unsignedLongAsBigInteger(longs.values[middle]);
-        return asLongUnsigned(a.add(b).shiftRight(1).longValue());
+        BigInteger a = unsignedLongToBigInteger(longs.values[middle - 1]);
+        BigInteger b = unsignedLongToBigInteger(longs.values[middle]);
+        return bigIntegerToUnsignedLong(a.add(b).shiftRight(1));
     }
 
     /**
@@ -169,9 +169,9 @@ static long ascendingUnsignedLong(LongBlock values, int firstValue, int count) {
         if (count % 2 == 1) {
             return values.getLong(middle);
         }
-        BigInteger a = unsignedLongAsBigInteger(values.getLong(middle - 1));
-        BigInteger b = unsignedLongAsBigInteger(values.getLong(middle));
-        return asLongUnsigned(a.add(b).shiftRight(1).longValue());
+        BigInteger a = unsignedLongToBigInteger(values.getLong(middle - 1));
+        BigInteger b = unsignedLongToBigInteger(values.getLong(middle));
+        return bigIntegerToUnsignedLong(a.add(b).shiftRight(1));
     }
 
     static class Ints {
diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvSlice.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvSlice.java
index 29ec231f08555..e054fc7e00e24 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvSlice.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvSlice.java
@@ -35,6 +35,7 @@
 import java.util.Objects;
 import java.util.function.Function;
 
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.stringToInt;
 import static org.elasticsearch.xpack.ql.expression.TypeResolutions.ParamOrdinal.FIRST;
 import static org.elasticsearch.xpack.ql.expression.TypeResolutions.ParamOrdinal.SECOND;
 import static org.elasticsearch.xpack.ql.expression.TypeResolutions.ParamOrdinal.THIRD;
@@ -129,8 +130,8 @@ public EvalOperator.ExpressionEvaluator.Factory toEvaluator(
         Function<Expression, EvalOperator.ExpressionEvaluator.Factory> toEvaluator
     ) {
         if (start.foldable() && end.foldable()) {
-            int startOffset = Integer.parseInt(String.valueOf(start.fold()));
-            int endOffset = Integer.parseInt(String.valueOf(end.fold()));
+            int startOffset = stringToInt(String.valueOf(start.fold()));
+            int endOffset = stringToInt(String.valueOf(end.fold()));
             checkStartEnd(startOffset, endOffset);
         }
         return switch (PlannerUtils.toElementType(field.dataType())) {
diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Div.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Div.java
index 42fd526cb3b99..170e3de6e4209 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Div.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Div.java
@@ -15,7 +15,7 @@
 import org.elasticsearch.xpack.ql.type.DataType;
 
 import static org.elasticsearch.xpack.esql.expression.predicate.operator.arithmetic.EsqlArithmeticOperation.OperationSymbol.DIV;
-import static org.elasticsearch.xpack.ql.util.NumericUtils.asLongUnsigned;
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.longToUnsignedLong;
 
 public class Div extends EsqlArithmeticOperation implements BinaryComparisonInversible {
 
@@ -73,7 +73,7 @@ static long processLongs(long lhs, long rhs) {
 
     @Evaluator(extraName = "UnsignedLongs", warnExceptions = { ArithmeticException.class })
     static long processUnsignedLongs(long lhs, long rhs) {
-        return asLongUnsigned(Long.divideUnsigned(asLongUnsigned(lhs), asLongUnsigned(rhs)));
+        return longToUnsignedLong(Long.divideUnsigned(longToUnsignedLong(lhs, true), longToUnsignedLong(rhs, true)), true);
     }
 
     @Evaluator(extraName = "Doubles")
diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mod.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mod.java
index 41a396819a7f2..bc1ad8fcb5f94 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mod.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/predicate/operator/arithmetic/Mod.java
@@ -13,7 +13,7 @@
 import org.elasticsearch.xpack.ql.tree.Source;
 
 import static org.elasticsearch.xpack.esql.expression.predicate.operator.arithmetic.EsqlArithmeticOperation.OperationSymbol.MOD;
-import static org.elasticsearch.xpack.ql.util.NumericUtils.asLongUnsigned;
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.longToUnsignedLong;
 
 public class Mod extends EsqlArithmeticOperation {
 
@@ -52,7 +52,7 @@ static long processLongs(long lhs, long rhs) {
 
     @Evaluator(extraName = "UnsignedLongs", warnExceptions = { ArithmeticException.class })
     static long processUnsignedLongs(long lhs, long rhs) {
-        return asLongUnsigned(Long.remainderUnsigned(asLongUnsigned(lhs), asLongUnsigned(rhs)));
+        return longToUnsignedLong(Long.remainderUnsigned(longToUnsignedLong(lhs, true), longToUnsignedLong(rhs, true)), true);
     }
 
     @Evaluator(extraName = "Doubles")
diff --git a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvgTests.java b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvgTests.java
index b1070cb7eb12b..c6c8826c6805a 100644
--- a/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvgTests.java
+++ b/x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/multivalue/MvAvgTests.java
@@ -25,6 +25,7 @@
 import java.util.function.Supplier;
 import java.util.stream.DoubleStream;
 
+import static org.elasticsearch.xpack.esql.type.EsqlDataTypeConverter.unsignedLongToDouble;
 import static org.hamcrest.Matchers.equalTo;
 
 public class MvAvgTests extends AbstractMultivalueFunctionTestCase {
@@ -53,7 +54,7 @@ public static Iterable<Object[]> parameters() {
              * So we have to go back to encoded `long` and then convert to double
              * using the production conversion. That'll round in the same way.
              */
-            (size, data) -> avg.apply(size, data.mapToDouble(v -> NumericUtils.unsignedLongToDouble(NumericUtils.asLongUnsigned(v))))
+            (size, data) -> avg.apply(size, data.mapToDouble(v -> unsignedLongToDouble(NumericUtils.asLongUnsigned(v))))
         );
         return parameterSuppliersFromTypedData(errorsForCasesWithoutExamples(anyNullIsNull(true, cases)));
     }