31517392897 has 2 divisors, whose sum is σ = 31517392898. Its totient is φ = 31517392896.

The previous prime is 31517392891. The next prime is 31517392909. The reversal of 31517392897 is 79829371513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17377566976 + 14139825921 = 131824^2 + 118911^2 .

It is an emirp because it is prime and its reverse (79829371513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31517392897 - 2¹⁵ = 31517360129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31517392891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15758696448 + 15758696449.

It is an arithmetic number, because the mean of its divisors is an integer number (15758696449).

Almost surely, 2^31517392897 is an apocalyptic number.

It is an amenable number.

31517392897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31517392897 is an equidigital number, since it uses as much as digits as its factorization.

31517392897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 55.

The spelling of 31517392897 in words is "thirty-one billion, five hundred seventeen million, three hundred ninety-two thousand, eight hundred ninety-seven".