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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 (-9,007,199,254,740,991 or about -9 quadrillion). 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.  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 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 Latest Draft (ECMA-262)
The definition of 'Number.MIN_SAFE_INTEGER' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support34 Yes31 No Yes9
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes31 Yes9 ?

See also

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