22931 has 4 divisors (see below), whose sum is σ = 23952. Its totient is φ = 21912.

The previous prime is 22921. The next prime is 22937. The reversal of 22931 is 13922.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13922 = 2 ⋅6961.

It is a cyclic number.

It is not a de Polignac number, because 22931 - 2¹⁴ = 6547 is a prime.

It is a super-2 number, since 2×22931² = 1051661522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (22937) 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, 476 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (5988).

2²²⁹³¹ is an apocalyptic number.

22931 is a deficient number, since it is larger than the sum of its proper divisors (1021).

22931 is an equidigital number, since it uses as much as digits as its factorization.

22931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020.

The product of its digits is 108, while the sum is 17.

The square root of 22931 is about 151.4298517466. The cubic root of 22931 is about 28.4102026426.

Subtracting from 22931 its reverse (13922), we obtain a palindrome (9009).

The spelling of 22931 in words is "twenty-two thousand, nine hundred thirty-one".