31591357131 has 16 divisors (see below), whose sum is σ = 43905922304. Its totient is φ = 20185840224.

The previous prime is 31591357123. The next prime is 31591357153. The reversal of 31591357131 is 13175319513.

It is not a de Polignac number, because 31591357131 - 2³ = 31591357123 is a prime.

It is a super-2 number, since 2×31591357131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31591357131.

It is not an unprimeable number, because it can be changed into a prime (31591357111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2116495 + ... + 2131368.

It is an arithmetic number, because the mean of its divisors is an integer number (2744120144).

Almost surely, 2^31591357131 is an apocalyptic number.

31591357131 is a deficient number, since it is larger than the sum of its proper divisors (12314565173).

31591357131 is a wasteful number, since it uses less digits than its factorization.

31591357131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4247970.

The product of its digits is 42525, while the sum is 39.

The spelling of 31591357131 in words is "thirty-one billion, five hundred ninety-one million, three hundred fifty-seven thousand, one hundred thirty-one".