23172931 has 4 divisors (see below), whose sum is σ = 23293192. Its totient is φ = 23052672.

The previous prime is 23172923. The next prime is 23172949. The reversal of 23172931 is 13927132.

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 23172931 - 2³ = 23172923 is a prime.

It is a super-2 number, since 2×23172931² = 1073969462261522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23172931.

It is not an unprimeable number, because it can be changed into a prime (23172911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59841 + ... + 60226.

It is an arithmetic number, because the mean of its divisors is an integer number (5823298).

Almost surely, 2^23172931 is an apocalyptic number.

23172931 is a deficient number, since it is larger than the sum of its proper divisors (120261).

23172931 is a wasteful number, since it uses less digits than its factorization.

23172931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120260.

The product of its digits is 2268, while the sum is 28.

The square root of 23172931 is about 4813.8270637820. The cubic root of 23172931 is about 285.0976622311.

The spelling of 23172931 in words is "twenty-three million, one hundred seventy-two thousand, nine hundred thirty-one".