Leetcode•Jun 25, 2025
Power of Four
Hazrat Ali
Leetcode
An integer n is a power of four, if there exists an integer x such that n == 4x.
Example 1:
Input: n = 16 Output: true
Example 2:
Input: n = 5 Output: false
Example 3:
Input: n = 1 Output: true
Solution
/**
* @param {number} num
* @return {boolean}
*/
const isPowerOfFour = num => {
return num > 0 && (num & (num - 1)) === 0 && (num & 0x55555555) !== 0;
};