Number.MIN_SAFE_INTEGER

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The Number.MIN_SAFE_INTEGER static data property represents the minimum safe integer in JavaScript, or -(2⁵³ - 1).

To represent integers smaller than this, consider using BigInt.

Try it

const x = Number.MIN_SAFE_INTEGER - 1;
const y = Number.MIN_SAFE_INTEGER - 2;

console.log(Number.MIN_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 about -9 quadrillion).

Property attributes of `Number.MIN_SAFE_INTEGER`
Writable	no
Enumerable	no
Configurable	no

Description

Double precision floating point format only has 52 bits to represent the mantissa, so it can only safely represent integers between -(2⁵³ – 1) and 2⁵³ – 1. Safe in this context refers to the ability to represent integers exactly and to correctly compare them. For example, Number.MIN_SAFE_INTEGER - 1 === Number.MIN_SAFE_INTEGER - 2 will evaluate to true, which is mathematically incorrect. See Number.isSafeInteger() for more information.

Because MIN_SAFE_INTEGER is a static property of Number, you always use it as Number.MIN_SAFE_INTEGER, rather than as a property of a number value.

Examples

Using MIN_SAFE_INTEGER

Number.MIN_SAFE_INTEGER; // -9007199254740991
-(2 ** 53 - 1); // -9007199254740991

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-number.min_safe_integer

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`MIN_SAFE_INTEGER`	34	12	31	21	9	34	31	21	9	2.0	37	1.0	0.12.0