23131540511 has 2 divisors, whose sum is σ = 23131540512. Its totient is φ = 23131540510.

The previous prime is 23131540507. The next prime is 23131540517. The reversal of 23131540511 is 11504513132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23131540511 - 2² = 23131540507 is a prime.

It is a super-2 number, since 2×23131540511² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131540517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565770255 + 11565770256.

It is an arithmetic number, because the mean of its divisors is an integer number (11565770256).

Almost surely, 2^23131540511 is an apocalyptic number.

23131540511 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131540511 is an equidigital number, since it uses as much as digits as its factorization.

23131540511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 23131540511 in words is "twenty-three billion, one hundred thirty-one million, five hundred forty thousand, five hundred eleven".