31137994347 has 16 divisors (see below), whose sum is σ = 43391742240. Its totient is φ = 19836214272.

The previous prime is 31137994339. The next prime is 31137994367. The reversal of 31137994347 is 74349973113.

It is not a de Polignac number, because 31137994347 - 2³ = 31137994339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31137994347.

It is not an unprimeable number, because it can be changed into a prime (31137994337) 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, 1836448 + ... + 1853325.

It is an arithmetic number, because the mean of its divisors is an integer number (2711983890).

Almost surely, 2^31137994347 is an apocalyptic number.

31137994347 is a deficient number, since it is larger than the sum of its proper divisors (12253747893).

31137994347 is a wasteful number, since it uses less digits than its factorization.

31137994347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689902.

The product of its digits is 1714608, while the sum is 51.

The spelling of 31137994347 in words is "thirty-one billion, one hundred thirty-seven million, nine hundred ninety-four thousand, three hundred forty-seven".