The JavaScript Number.MAX_SAFE_INTEGER is a constant number that represents the maximum safe integer. This constant has a value of (2⁵³ - 1). Here safe refers to the ability to represent integers and to compare them.

Syntax:

Number.MAX_SAFE_INTEGER

Return Value: A constant number.

Example 1: Below example illustrates the usage of Number.MAX_SAFE_INTEGER

const a = Number.MAX_SAFE_INTEGER + 1;
const b = Number.MAX_SAFE_INTEGER + 2;

console.log(Number.MAX_SAFE_INTEGER);
console.log(a);
console.log(a === b);

const a = Number.MAX_SAFE_INTEGER + 1;

const b = Number.MAX_SAFE_INTEGER + 2;

​

console.log(Number.MAX_SAFE_INTEGER);

console.log(a);

console.log(a === b);

Output:

9007199254740991
9007199254740992
true

Example 2: Below example illustrates the usage of the constants Number.MAX_SAFE_INTEGER using Math.pow() function.

const a = Number.MAX_SAFE_INTEGER;
const b = -(Math.pow(2, 53) - 1);

console.log(a);
console.log(b);
console.log(a === b);

const a = Number.MAX_SAFE_INTEGER;

const b = -(Math.pow(2, 53) - 1);

​

console.log(a);

console.log(b);

console.log(a === b);

Output:

9007199254740991
-9007199254740991
false

Supported Browsers:

• Chrome 34 and above
• Internet Explorer (Not Supported)
• Firefox 31 and above
• Edge 12 and above
• Safari 9 and above
• Opera 21 and above

We have a complete list of JavaScript Number constructor, properties, and methods list, to know more about the numbers please go through that article.