540242531 has 4 divisors (see below), whose sum is σ = 542503200. Its totient is φ = 537981864.

The previous prime is 540242509. The next prime is 540242533. The reversal of 540242531 is 135242045.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135242045 = 5 ⋅27048409.

It is a cyclic number.

It is not a de Polignac number, because 540242531 - 2⁶ = 540242467 is a prime.

It is a super-2 number, since 2×540242531² = 583723984602571922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 540242531.

It is not an unprimeable number, because it can be changed into a prime (540242533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1129976 + ... + 1130453.

It is an arithmetic number, because the mean of its divisors is an integer number (135625800).

Almost surely, 2^540242531 is an apocalyptic number.

540242531 is a deficient number, since it is larger than the sum of its proper divisors (2260669).

540242531 is a wasteful number, since it uses less digits than its factorization.

540242531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260668.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 540242531 is about 23243.1179276792. The cubic root of 540242531 is about 814.4471797719.

Adding to 540242531 its reverse (135242045), we get a palindrome (675484576).

The spelling of 540242531 in words is "five hundred forty million, two hundred forty-two thousand, five hundred thirty-one".