31312815937 has 8 divisors (see below), whose sum is σ = 33725932520. Its totient is φ = 28900333440.

The previous prime is 31312815931. The next prime is 31312815973. The reversal of 31312815937 is 73951821313.

It can be written as a sum of positive squares in 4 ways, for example, as 1231729216 + 30081086721 = 35096^2 + 173439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312815937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31312815893 and 31312815902.

It is not an unprimeable number, because it can be changed into a prime (31312815931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 53364 + ... + 255877.

It is an arithmetic number, because the mean of its divisors is an integer number (4215741565).

Almost surely, 2^31312815937 is an apocalyptic number.

It is an amenable number.

31312815937 is a deficient number, since it is larger than the sum of its proper divisors (2413116583).

31312815937 is a wasteful number, since it uses less digits than its factorization.

31312815937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317043.

The product of its digits is 136080, while the sum is 43.

The spelling of 31312815937 in words is "thirty-one billion, three hundred twelve million, eight hundred fifteen thousand, nine hundred thirty-seven".