31213085968 has 20 divisors (see below), whose sum is σ = 60479023068. Its totient is φ = 15605596160.

The previous prime is 31213085957. The next prime is 31213085987. The reversal of 31213085968 is 86958031213.

It can be written as a sum of positive squares in 2 ways, for example, as 18514500624 + 12698585344 = 136068^2 + 112688^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267408 + ... + 365968.

Almost surely, 2^31213085968 is an apocalyptic number.

It is an amenable number.

31213085968 is a deficient number, since it is larger than the sum of its proper divisors (29265937100).

31213085968 is a wasteful number, since it uses less digits than its factorization.

31213085968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118362 (or 118356 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 31213085968 in words is "thirty-one billion, two hundred thirteen million, eighty-five thousand, nine hundred sixty-eight".