540206531 has 4 divisors (see below), whose sum is σ = 542115672. Its totient is φ = 538297392.

The previous prime is 540206489. The next prime is 540206533. The reversal of 540206531 is 135602045.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135602045 = 5 ⋅27120409.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540206531 is a prime.

It is a super-2 number, since 2×540206531² = 583646192270107922, 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 540206531.

It is not an unprimeable number, because it can be changed into a prime (540206533) 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, 954146 + ... + 954711.

It is an arithmetic number, because the mean of its divisors is an integer number (135528918).

Almost surely, 2^540206531 is an apocalyptic number.

540206531 is a deficient number, since it is larger than the sum of its proper divisors (1909141).

540206531 is a wasteful number, since it uses less digits than its factorization.

540206531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909140.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 540206531 is about 23242.3434919975. The cubic root of 540206531 is about 814.4290886689.

Adding to 540206531 its reverse (135602045), we get a palindrome (675808576).

The spelling of 540206531 in words is "five hundred forty million, two hundred six thousand, five hundred thirty-one".