231687034913 has 2 divisors, whose sum is σ = 231687034914. Its totient is φ = 231687034912.

The previous prime is 231687034867. The next prime is 231687034919. The reversal of 231687034913 is 319430786132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231580387984 + 106646929 = 481228^2 + 10327^2 .

It is a cyclic number.

It is not a de Polignac number, because 231687034913 - 2³⁰ = 230613293089 is a prime.

It is not a weakly prime, because it can be changed into another prime (231687034919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115843517456 + 115843517457.

It is an arithmetic number, because the mean of its divisors is an integer number (115843517457).

Almost surely, 2^231687034913 is an apocalyptic number.

It is an amenable number.

231687034913 is a deficient number, since it is larger than the sum of its proper divisors (1).

231687034913 is an equidigital number, since it uses as much as digits as its factorization.

231687034913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 231687034913 in words is "two hundred thirty-one billion, six hundred eighty-seven million, thirty-four thousand, nine hundred thirteen".