23931913 has 2 divisors, whose sum is σ = 23931914. Its totient is φ = 23931912.

The previous prime is 23931889. The next prime is 23931923. The reversal of 23931913 is 31913932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22771984 + 1159929 = 4772^2 + 1077^2 .

It is a cyclic number.

It is not a de Polignac number, because 23931913 - 2⁵ = 23931881 is a prime.

It is not a weakly prime, because it can be changed into another prime (23931923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11965956 + 11965957.

It is an arithmetic number, because the mean of its divisors is an integer number (11965957).

Almost surely, 2^23931913 is an apocalyptic number.

It is an amenable number.

23931913 is a deficient number, since it is larger than the sum of its proper divisors (1).

23931913 is an equidigital number, since it uses as much as digits as its factorization.

23931913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 31.

The square root of 23931913 is about 4892.0254496476. The cubic root of 23931913 is about 288.1768822427.

The spelling of 23931913 in words is "twenty-three million, nine hundred thirty-one thousand, nine hundred thirteen".