31378491875 has 10 divisors (see below), whose sum is σ = 39210564228. Its totient is φ = 25102793000.

The previous prime is 31378491857. The next prime is 31378491883. The reversal of 31378491875 is 57819487313.

It is a happy number.

It is not a de Polignac number, because 31378491875 - 2²² = 31374297571 is a prime.

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 31378491875.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 25102169 + ... + 25103418.

Almost surely, 2^31378491875 is an apocalyptic number.

31378491875 is a deficient number, since it is larger than the sum of its proper divisors (7832072353).

31378491875 is an frugal number, since it uses more digits than its factorization.

31378491875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50205607 (or 50205592 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 56.

The spelling of 31378491875 in words is "thirty-one billion, three hundred seventy-eight million, four hundred ninety-one thousand, eight hundred seventy-five".