23509931 has 2 divisors, whose sum is σ = 23509932. Its totient is φ = 23509930.

The previous prime is 23509921. The next prime is 23509939. The reversal of 23509931 is 13990532.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23509931 - 2⁶ = 23509867 is a prime.

It is a super-2 number, since 2×23509931² = 1105433711249522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23509939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11754965 + 11754966.

It is an arithmetic number, because the mean of its divisors is an integer number (11754966).

Almost surely, 2^23509931 is an apocalyptic number.

23509931 is a deficient number, since it is larger than the sum of its proper divisors (1).

23509931 is an equidigital number, since it uses as much as digits as its factorization.

23509931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 23509931 is about 4848.7040536622. The cubic root of 23509931 is about 286.4730585324.

The spelling of 23509931 in words is "twenty-three million, five hundred nine thousand, nine hundred thirty-one".