31371138557 has 4 divisors (see below), whose sum is σ = 34223060256. Its totient is φ = 28519216860.

The previous prime is 31371138529. The next prime is 31371138587. The reversal of 31371138557 is 75583117313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31371138557 - 2²⁶ = 31304029693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31371138527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1425960833 + ... + 1425960854.

It is an arithmetic number, because the mean of its divisors is an integer number (8555765064).

Almost surely, 2^31371138557 is an apocalyptic number.

It is an amenable number.

31371138557 is a deficient number, since it is larger than the sum of its proper divisors (2851921699).

31371138557 is a wasteful number, since it uses less digits than its factorization.

31371138557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851921698.

The product of its digits is 264600, while the sum is 44.

The spelling of 31371138557 in words is "thirty-one billion, three hundred seventy-one million, one hundred thirty-eight thousand, five hundred fifty-seven".