23531513 has 2 divisors, whose sum is σ = 23531514. Its totient is φ = 23531512.

The previous prime is 23531509. The next prime is 23531527. The reversal of 23531513 is 31513532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22250089 + 1281424 = 4717^2 + 1132^2 .

It is a cyclic number.

It is not a de Polignac number, because 23531513 - 2² = 23531509 is a prime.

It is not a weakly prime, because it can be changed into another prime (23531533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765756 + 11765757.

It is an arithmetic number, because the mean of its divisors is an integer number (11765757).

Almost surely, 2^23531513 is an apocalyptic number.

It is an amenable number.

23531513 is a deficient number, since it is larger than the sum of its proper divisors (1).

23531513 is an equidigital number, since it uses as much as digits as its factorization.

23531513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 23.

The square root of 23531513 is about 4850.9290862679. The cubic root of 23531513 is about 286.5606920042.

The spelling of 23531513 in words is "twenty-three million, five hundred thirty-one thousand, five hundred thirteen".