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    This is an experimental technology, part of the Harmony (ECMAScript 6) proposal.
    Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.


    The Number.MAX_SAFE_INTEGER constant represents the maximum safe integer in JavaScript (253 - 1).

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


    The MAX_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 MAX_SAFE_INTEGER is a static property of Number, you always use it as Number.MAX_SAFE_INTEGER, rather than as a property of a Number object you created.


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


    Specification Status Comment
    ECMAScript 6 (ECMA-262)
    The definition of 'Number.MAX_SAFE_INTEGER' in that specification.
    Draft Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 34 31 (31) Not supported (Yes) Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) 32.0 (32) Not supported Not supported Not supported

    See also

    Document Tags and Contributors

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