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) 9
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 9

See also

Document Tags and Contributors

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