31297855745 has 16 divisors (see below), whose sum is σ = 41841167760. Its totient is φ = 22315286784.

The previous prime is 31297855739. The next prime is 31297855769. The reversal of 31297855745 is 54755879213.

It is a Cunningham number, because it is equal to 176912²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 8066913856 + 23230941889 = 89816^2 + 152417^2 .

It is a cyclic number.

It is not a de Polignac number, because 31297855745 - 2¹⁸ = 31297593601 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 8299934 + ... + 8303703.

It is an arithmetic number, because the mean of its divisors is an integer number (2615072985).

Almost surely, 2^31297855745 is an apocalyptic number.

It is an amenable number.

31297855745 is a deficient number, since it is larger than the sum of its proper divisors (10543312015).

31297855745 is a wasteful number, since it uses less digits than its factorization.

31297855745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16603684.

The product of its digits is 10584000, while the sum is 56.

The spelling of 31297855745 in words is "thirty-one billion, two hundred ninety-seven million, eight hundred fifty-five thousand, seven hundred forty-five".