23921091 has 12 divisors (see below), whose sum is σ = 36585432. Its totient is φ = 15009216.

The previous prime is 23921071. The next prime is 23921101. The reversal of 23921091 is 19012932.

It is not a de Polignac number, because 23921091 - 2⁵ = 23921059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23921011) 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 11 ways as a sum of consecutive naturals, for example, 78021 + ... + 78326.

It is an arithmetic number, because the mean of its divisors is an integer number (3048786).

Almost surely, 2^23921091 is an apocalyptic number.

23921091 is a deficient number, since it is larger than the sum of its proper divisors (12664341).

23921091 is a wasteful number, since it uses less digits than its factorization.

23921091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156370 (or 156367 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 23921091 is about 4890.9192387526. The cubic root of 23921091 is about 288.1334378759.

The spelling of 23921091 in words is "twenty-three million, nine hundred twenty-one thousand, ninety-one".