The Number.MIN_SAFE_INTEGER constant represents the minimum safe integer in JavaScript (-(253 - 1)).

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


The MIN_SAFE_INTEGER constant has a value of -9007199254740991. The reasoning behind that number is that JavaScript uses double-precision floating-point format numbers as specified in IEEE 754 and can only safely represent numbers between -(253 - 1) and 253 - 1.

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 object you created.


Number.MIN_SAFE_INTEGER // -9007199254740991
-(Math.pow(2, 53) - 1)  // -9007199254740991


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.MIN_SAFE_INTEGER' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Number.MIN_SAFE_INTEGER' in that specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 34 31 (31) No support (Yes) No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) 32.0 (32) No support No support No support

See also

Document Tags and Contributors

 Contributors to this page: fscholz, Mingun, realityking, Nevallem
 Last updated by: fscholz,