22155931 has 4 divisors (see below), whose sum is σ = 25321072. Its totient is φ = 18990792.

The previous prime is 22155911. The next prime is 22155943. The reversal of 22155931 is 13955122.

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 22155931 - 2¹⁷ = 22024859 is a prime.

It is a super-2 number, since 2×22155931² = 981770556953522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22155931.

It is not an unprimeable number, because it can be changed into a prime (22155901) 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, 1582560 + ... + 1582573.

It is an arithmetic number, because the mean of its divisors is an integer number (6330268).

Almost surely, 2^22155931 is an apocalyptic number.

22155931 is a deficient number, since it is larger than the sum of its proper divisors (3165141).

22155931 is an equidigital number, since it uses as much as digits as its factorization.

22155931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165140.

The product of its digits is 2700, while the sum is 28.

The square root of 22155931 is about 4707.0087104232. The cubic root of 22155931 is about 280.8643824079.

The spelling of 22155931 in words is "twenty-two million, one hundred fifty-five thousand, nine hundred thirty-one".