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Number.MAXSAFEINTEGER

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The Number.MAX_SAFE_INTEGER static data property represents the maximum safe integer in JavaScript (253 – 1).

For larger integers, consider using {{jsxref("BigInt")}}.

{{InteractiveExample("JavaScript Demo: Number.MAX_SAFE_INTEGER")}}

```js interactive-example const x = Number.MAX_SAFE_INTEGER + 1; const y = Number.MAX_SAFE_INTEGER + 2;

console.log(Number.MAX_SAFE_INTEGER); // Expected output: 9007199254740991

console.log(x); // Expected output: 9007199254740992

console.log(x === y); // Expected output: true

## Value

`9007199254740991` (9,007,199,254,740,991, or \~9 quadrillion).

{{js_property_attributes(0, 0, 0)}}

## Description

[Double precision floating point format](https://en.wikipedia.org/wiki/Double_precision_floating-point_format) only has 52 bits to represent the [mantissa](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#number_encoding), so it can only safely represent integers between -(2<sup>53</sup> – 1) and 2<sup>53</sup> – 1. "Safe" in this context refers to the ability to represent integers exactly and to compare them correctly. For example, `Number.MAX_SAFE_INTEGER + 1 === Number.MAX_SAFE_INTEGER + 2` will evaluate to true, which is mathematically incorrect. See {{jsxref("Number.isSafeInteger()")}} for more information.

As mentioned in {{jsxref("Number.EPSILON")}}, the precision of numbers depends on their magnitude. `Number.MAX_SAFE_INTEGER` represents the largest value at which integer-level operations can be performed precisely, but you can still perform meaningful arithmetic on numbers larger than that, just without integer-level precision. The largest representable number in JavaScript is actually {{jsxref("Number.MAX_VALUE")}}, which is approximately 1.7976931348623157 × 10<sup>308</sup>.

Because `MAX_SAFE_INTEGER` is a static property of {{jsxref("Number")}}, you always use it as `Number.MAX_SAFE_INTEGER`, rather than as a property of a number value.

## Examples

### Return value of MAX_SAFE_INTEGER

```js
Number.MAX_SAFE_INTEGER; // 9007199254740991

Relationship between MAX_SAFE_INTEGER and EPSILON#

{{jsxref("Number.EPSILON")}} is 2-52, while MAX_SAFE_INTEGER is 253 – 1 — both of them are derived from the width of the mantissa, which is 53 bits (with the highest bit always being 1). Multiplying them will give a value very close — but not equal — to 2.

Number.MAX_SAFE_INTEGER * Number.EPSILON; // 1.9999999999999998

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#