23531917 has 2 divisors, whose sum is σ = 23531918. Its totient is φ = 23531916.

The previous prime is 23531891. The next prime is 23531929. The reversal of 23531917 is 71913532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23097636 + 434281 = 4806^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 23531917 - 2¹⁵ = 23499149 is a prime.

It is a super-2 number, since 2×23531917² = 1107502235389778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23531987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765958 + 11765959.

It is an arithmetic number, because the mean of its divisors is an integer number (11765959).

Almost surely, 2^23531917 is an apocalyptic number.

It is an amenable number.

23531917 is a deficient number, since it is larger than the sum of its proper divisors (1).

23531917 is an equidigital number, since it uses as much as digits as its factorization.

23531917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 23531917 is about 4850.9707275967. The cubic root of 23531917 is about 286.5623319308.

The spelling of 23531917 in words is "twenty-three million, five hundred thirty-one thousand, nine hundred seventeen".