31659840491 has 2 divisors, whose sum is σ = 31659840492. Its totient is φ = 31659840490.

The previous prime is 31659840439. The next prime is 31659840521. The reversal of 31659840491 is 19404895613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31659840491 - 2¹⁴ = 31659824107 is a prime.

It is not a weakly prime, because it can be changed into another prime (31659840691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15829920245 + 15829920246.

It is an arithmetic number, because the mean of its divisors is an integer number (15829920246).

Almost surely, 2^31659840491 is an apocalyptic number.

31659840491 is a deficient number, since it is larger than the sum of its proper divisors (1).

31659840491 is an equidigital number, since it uses as much as digits as its factorization.

31659840491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 31659840491 in words is "thirty-one billion, six hundred fifty-nine million, eight hundred forty thousand, four hundred ninety-one".