22901891 has 2 divisors, whose sum is σ = 22901892. Its totient is φ = 22901890.

The previous prime is 22901887. The next prime is 22901899. The reversal of 22901891 is 19810922.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22901891 - 2² = 22901887 is a prime.

It is a super-2 number, since 2×22901891² = 1048993222751762, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (22901899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11450945 + 11450946.

It is an arithmetic number, because the mean of its divisors is an integer number (11450946).

Almost surely, 2^22901891 is an apocalyptic number.

22901891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22901891 is an equidigital number, since it uses as much as digits as its factorization.

22901891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 22901891 is about 4785.5920218924. The cubic root of 22901891 is about 283.9817608798.

The spelling of 22901891 in words is "twenty-two million, nine hundred one thousand, eight hundred ninety-one".