531291508865 has 32 divisors (see below), whose sum is σ = 690149690496. Its totient is φ = 390310018560.

The previous prime is 531291508861. The next prime is 531291508919. The reversal of 531291508865 is 568805192135.

It is not a de Polignac number, because 531291508865 - 2² = 531291508861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531291508861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11326310 + ... + 11373120.

It is an arithmetic number, because the mean of its divisors is an integer number (21567177828).

Almost surely, 2^531291508865 is an apocalyptic number.

It is an amenable number.

531291508865 is a deficient number, since it is larger than the sum of its proper divisors (158858181631).

531291508865 is a wasteful number, since it uses less digits than its factorization.

531291508865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47729.

The product of its (nonzero) digits is 2592000, while the sum is 53.

The spelling of 531291508865 in words is "five hundred thirty-one billion, two hundred ninety-one million, five hundred eight thousand, eight hundred sixty-five".