22156231 has 2 divisors, whose sum is σ = 22156232. Its totient is φ = 22156230.

The previous prime is 22156217. The next prime is 22156241. The reversal of 22156231 is 13265122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22156231 - 2²³ = 13767623 is a prime.

It is a super-2 number, since 2×22156231² = 981797144250722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22156201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078115 + 11078116.

It is an arithmetic number, because the mean of its divisors is an integer number (11078116).

Almost surely, 2^22156231 is an apocalyptic number.

22156231 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156231 is an equidigital number, since it uses as much as digits as its factorization.

22156231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 22156231 is about 4707.0405776879. The cubic root of 22156231 is about 280.8656500735.

The spelling of 22156231 in words is "twenty-two million, one hundred fifty-six thousand, two hundred thirty-one".