31585136984 has 8 divisors (see below), whose sum is σ = 59222131860. Its totient is φ = 15792568488.

The previous prime is 31585136981. The next prime is 31585137007. The reversal of 31585136984 is 48963158513.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31585136981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974071054 + ... + 1974071069.

Almost surely, 2^31585136984 is an apocalyptic number.

It is an amenable number.

31585136984 is a deficient number, since it is larger than the sum of its proper divisors (27636994876).

31585136984 is a wasteful number, since it uses less digits than its factorization.

31585136984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948142129 (or 3948142125 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 53.

The spelling of 31585136984 in words is "thirty-one billion, five hundred eighty-five million, one hundred thirty-six thousand, nine hundred eighty-four".