22491023 has 2 divisors, whose sum is σ = 22491024. Its totient is φ = 22491022.

The previous prime is 22491019. The next prime is 22491047. The reversal of 22491023 is 32019422.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22491023 - 2² = 22491019 is a prime.

It is a super-2 number, since 2×22491023² = 1011692231173058, 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 22491023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22491013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11245511 + 11245512.

It is an arithmetic number, because the mean of its divisors is an integer number (11245512).

Almost surely, 2^22491023 is an apocalyptic number.

22491023 is a deficient number, since it is larger than the sum of its proper divisors (1).

22491023 is an equidigital number, since it uses as much as digits as its factorization.

22491023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 22491023 is about 4742.4701369645. The cubic root of 22491023 is about 282.2732584236.

The spelling of 22491023 in words is "twenty-two million, four hundred ninety-one thousand, twenty-three".