22564531 has 4 divisors (see below), whose sum is σ = 24615864. Its totient is φ = 20513200.

The previous prime is 22564513. The next prime is 22564537. The reversal of 22564531 is 13546522.

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 22564531 - 2⁵ = 22564499 is a prime.

It is a super-2 number, since 2×22564531² = 1018316118499922, 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 22564531.

It is not an unprimeable number, because it can be changed into a prime (22564537) 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, 1025650 + ... + 1025671.

It is an arithmetic number, because the mean of its divisors is an integer number (6153966).

Almost surely, 2^22564531 is an apocalyptic number.

22564531 is a deficient number, since it is larger than the sum of its proper divisors (2051333).

22564531 is a wasteful number, since it uses less digits than its factorization.

22564531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051332.

The product of its digits is 7200, while the sum is 28.

The square root of 22564531 is about 4750.2137846627. The cubic root of 22564531 is about 282.5804443681.

Subtracting from 22564531 its reverse (13546522), we obtain a square (9018009 = 3003²).

The spelling of 22564531 in words is "twenty-two million, five hundred sixty-four thousand, five hundred thirty-one".