31211381904 has 40 divisors (see below), whose sum is σ = 80708500992. Its totient is φ = 10393587840.

The previous prime is 31211381893. The next prime is 31211381911. The reversal of 31211381904 is 40918311213.

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, 269424 + ... + 367439.

Almost surely, 2^31211381904 is an apocalyptic number.

It is an amenable number.

31211381904 is an abundant number, since it is smaller than the sum of its proper divisors (49497119088).

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

31211381904 is a wasteful number, since it uses less digits than its factorization.

31211381904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637895 (or 637889 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The spelling of 31211381904 in words is "thirty-one billion, two hundred eleven million, three hundred eighty-one thousand, nine hundred four".