31871867994 has 48 divisors (see below), whose sum is σ = 73021987584. Its totient is φ = 10030478400.

The previous prime is 31871867987. The next prime is 31871868011. The reversal of 31871867994 is 49976817813.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673684 + ... + 719439.

It is an arithmetic number, because the mean of its divisors is an integer number (1521291408).

Almost surely, 2^31871867994 is an apocalyptic number.

31871867994 is an abundant number, since it is smaller than the sum of its proper divisors (41150119590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31871867994 is a wasteful number, since it uses less digits than its factorization.

31871867994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393203 (or 1393200 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The spelling of 31871867994 in words is "thirty-one billion, eight hundred seventy-one million, eight hundred sixty-seven thousand, nine hundred ninety-four".