22565531 has 4 divisors (see below), whose sum is σ = 22579272. Its totient is φ = 22551792.

The previous prime is 22565527. The next prime is 22565537. The reversal of 22565531 is 13556522.

It is a happy number.

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 22565531 - 2² = 22565527 is a prime.

It is a super-2 number, since 2×22565531² = 1018406378623922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22565494 and 22565503.

It is not an unprimeable number, because it can be changed into a prime (22565537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4010 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (5644818).

Almost surely, 2^22565531 is an apocalyptic number.

22565531 is a deficient number, since it is larger than the sum of its proper divisors (13741).

22565531 is a wasteful number, since it uses less digits than its factorization.

22565531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13740.

The product of its digits is 9000, while the sum is 29.

The square root of 22565531 is about 4750.3190419171. The cubic root of 22565531 is about 282.5846187110.

Subtracting from 22565531 its reverse (13556522), we obtain a palindrome (9009009).

It can be divided in two parts, 225 and 65531, that added together give a palindrome (65756).

The spelling of 22565531 in words is "twenty-two million, five hundred sixty-five thousand, five hundred thirty-one".