31711985168 has 20 divisors (see below), whose sum is σ = 61753865580. Its totient is φ = 15775503744.

The previous prime is 31711985159. The next prime is 31711985189. The reversal of 31711985168 is 86158911713.

It can be written as a sum of positive squares in 2 ways, for example, as 28590751744 + 3121233424 = 169088^2 + 55868^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5027303 + ... + 5033606.

It is an arithmetic number, because the mean of its divisors is an integer number (3087693279).

Almost surely, 2^31711985168 is an apocalyptic number.

It is an amenable number.

31711985168 is a deficient number, since it is larger than the sum of its proper divisors (30041880412).

31711985168 is a wasteful number, since it uses less digits than its factorization.

31711985168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061114 (or 10061108 counting only the distinct ones).

The product of its digits is 362880, while the sum is 50.

The spelling of 31711985168 in words is "thirty-one billion, seven hundred eleven million, nine hundred eighty-five thousand, one hundred sixty-eight".