23256531 has 8 divisors (see below), whose sum is σ = 34454160. Its totient is φ = 15504336.

The previous prime is 23256523. The next prime is 23256599. The reversal of 23256531 is 13565232.

23256531 is a `hidden beast` number, since 2 + 3 + 2 + 5 + 653 + 1 = 666.

It is not a de Polignac number, because 23256531 - 2³ = 23256523 is a prime.

It is a super-2 number, since 2×23256531² = 1081732468307922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 861353 = 23256531 / (2 + 3 + 2 + 5 + 6 + 5 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 23256495 and 23256504.

It is not an unprimeable number, because it can be changed into a prime (23256031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430650 + ... + 430703.

It is an arithmetic number, because the mean of its divisors is an integer number (4306770).

Almost surely, 2^23256531 is an apocalyptic number.

23256531 is a deficient number, since it is larger than the sum of its proper divisors (11197629).

23256531 is an equidigital number, since it uses as much as digits as its factorization.

23256531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861362 (or 861356 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 23256531 is about 4822.5025660957. The cubic root of 23256531 is about 285.4400956798.

The spelling of 23256531 in words is "twenty-three million, two hundred fifty-six thousand, five hundred thirty-one".