31670520997 has 2 divisors, whose sum is σ = 31670520998. Its totient is φ = 31670520996.

The previous prime is 31670520977. The next prime is 31670521007. The reversal of 31670520997 is 79902507613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31154368036 + 516152961 = 176506^2 + 22719^2 .

It is a cyclic number.

It is not a de Polignac number, because 31670520997 - 2²³ = 31662132389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31670520997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31670520977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15835260498 + 15835260499.

It is an arithmetic number, because the mean of its divisors is an integer number (15835260499).

Almost surely, 2^31670520997 is an apocalyptic number.

It is an amenable number.

31670520997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31670520997 is an equidigital number, since it uses as much as digits as its factorization.

31670520997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 714420, while the sum is 49.

The spelling of 31670520997 in words is "thirty-one billion, six hundred seventy million, five hundred twenty thousand, nine hundred ninety-seven".