Number.MIN_SAFE_INTEGER

{{JSRef}} 

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 {{jsxref("BigInt")}} .

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

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).

{{js_property_attributes(0, 0, 0)}} 

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 {{jsxref("Number.isSafeInteger()")}}  for more information.

Because MIN_SAFE_INTEGER is a static property of {{jsxref("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

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• Polyfill of Number.MIN_SAFE_INTEGER in core-js
• {{jsxref("Number.MAX_SAFE_INTEGER")}} 
• {{jsxref("Number.isSafeInteger()")}} 
• {{jsxref("BigInt")}}