23091031 has 4 divisors (see below), whose sum is σ = 23105200. Its totient is φ = 23076864.

The previous prime is 23091017. The next prime is 23091041. The reversal of 23091031 is 13019032.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23091031 is a prime.

It is a super-2 number, since 2×23091031² = 1066391425285922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23091041) 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 in 3 ways as a sum of consecutive naturals, for example, 4266 + ... + 8023.

It is an arithmetic number, because the mean of its divisors is an integer number (5776300).

Almost surely, 2^23091031 is an apocalyptic number.

23091031 is a deficient number, since it is larger than the sum of its proper divisors (14169).

23091031 is a wasteful number, since it uses less digits than its factorization.

23091031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14168.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 23091031 is about 4805.3127889868. The cubic root of 23091031 is about 284.7613925739.

The spelling of 23091031 in words is "twenty-three million, ninety-one thousand, thirty-one".