616564531 has 4 divisors (see below), whose sum is σ = 672615864. Its totient is φ = 560513200.

The previous prime is 616564511. The next prime is 616564537. The reversal of 616564531 is 135465616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616564531 - 2⁹ = 616564019 is a prime.

It is a super-2 number, since 2×616564531² = 760303641774499922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616564537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28025650 + ... + 28025671.

It is an arithmetic number, because the mean of its divisors is an integer number (168153966).

Almost surely, 2^616564531 is an apocalyptic number.

616564531 is a deficient number, since it is larger than the sum of its proper divisors (56051333).

616564531 is a wasteful number, since it uses less digits than its factorization.

616564531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56051332.

The product of its digits is 64800, while the sum is 37.

The square root of 616564531 is about 24830.7174886269. The cubic root of 616564531 is about 851.1240174722.

The spelling of 616564531 in words is "six hundred sixteen million, five hundred sixty-four thousand, five hundred thirty-one".