31999711394 has 16 divisors (see below), whose sum is σ = 54887457408. Its totient is φ = 13706459712.

The previous prime is 31999711333. The next prime is 31999711409. The reversal of 31999711394 is 49311799913.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616007 + ... + 665930.

It is an arithmetic number, because the mean of its divisors is an integer number (3430466088).

Almost surely, 2^31999711394 is an apocalyptic number.

31999711394 is a deficient number, since it is larger than the sum of its proper divisors (22887746014).

31999711394 is a wasteful number, since it uses less digits than its factorization.

31999711394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283729.

The product of its digits is 1653372, while the sum is 56.

The spelling of 31999711394 in words is "thirty-one billion, nine hundred ninety-nine million, seven hundred eleven thousand, three hundred ninety-four".