22555531 has 2 divisors, whose sum is σ = 22555532. Its totient is φ = 22555530.

The previous prime is 22555529. The next prime is 22555541. The reversal of 22555531 is 13555522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22555531 - 2¹ = 22555529 is a prime.

It is a super-2 number, since 2×22555531² = 1017503957383922, which contains 22 as substring.

Together with 22555529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 22555531.

It is not a weakly prime, because it can be changed into another prime (22555541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11277765 + 11277766.

It is an arithmetic number, because the mean of its divisors is an integer number (11277766).

Almost surely, 2^22555531 is an apocalyptic number.

22555531 is a deficient number, since it is larger than the sum of its proper divisors (1).

22555531 is an equidigital number, since it uses as much as digits as its factorization.

22555531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 28.

The square root of 22555531 is about 4749.2663643978. The cubic root of 22555531 is about 282.5428697309.

Subtracting from 22555531 its reverse (13555522), we obtain a palindrome (9000009).

The spelling of 22555531 in words is "twenty-two million, five hundred fifty-five thousand, five hundred thirty-one".