31321310312 has 8 divisors (see below), whose sum is σ = 58727456850. Its totient is φ = 15660655152.

The previous prime is 31321310309. The next prime is 31321310327. The reversal of 31321310312 is 21301312313.

It can be written as a sum of positive squares in only one way, i.e., 27893676196 + 3427634116 = 167014^2 + 58546^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1957581887 + ... + 1957581902.

Almost surely, 2^31321310312 is an apocalyptic number.

It is an amenable number.

31321310312 is a deficient number, since it is larger than the sum of its proper divisors (27406146538).

31321310312 is a wasteful number, since it uses less digits than its factorization.

31321310312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915163795 (or 3915163791 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31321310312 its reverse (21301312313), we get a palindrome (52622622625).

The spelling of 31321310312 in words is "thirty-one billion, three hundred twenty-one million, three hundred ten thousand, three hundred twelve".