31377358631 has 4 divisors (see below), whose sum is σ = 31535034000. Its totient is φ = 31219683264.

The previous prime is 31377358553. The next prime is 31377358633. The reversal of 31377358631 is 13685377313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31377358631 - 2²² = 31373164327 is a prime.

It is a super-2 number, since 2×31377358631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31377358633) 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, 78837386 + ... + 78837783.

It is an arithmetic number, because the mean of its divisors is an integer number (7883758500).

Almost surely, 2^31377358631 is an apocalyptic number.

31377358631 is a deficient number, since it is larger than the sum of its proper divisors (157675369).

31377358631 is a wasteful number, since it uses less digits than its factorization.

31377358631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157675368.

The product of its digits is 952560, while the sum is 47.

The spelling of 31377358631 in words is "thirty-one billion, three hundred seventy-seven million, three hundred fifty-eight thousand, six hundred thirty-one".