23402531 has 2 divisors, whose sum is σ = 23402532. Its totient is φ = 23402530.

The previous prime is 23402479. The next prime is 23402539. The reversal of 23402531 is 13520432.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23402531 - 2²² = 19208227 is a prime.

It is a super-2 number, since 2×23402531² = 1095356914411922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23402539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11701265 + 11701266.

It is an arithmetic number, because the mean of its divisors is an integer number (11701266).

Almost surely, 2^23402531 is an apocalyptic number.

23402531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23402531 is an equidigital number, since it uses as much as digits as its factorization.

23402531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23402531 is about 4837.6162518331. The cubic root of 23402531 is about 286.0361626400.

Adding to 23402531 its reverse (13520432), we get a palindrome (36922963).

The spelling of 23402531 in words is "twenty-three million, four hundred two thousand, five hundred thirty-one".