31995690679 has 2 divisors, whose sum is σ = 31995690680. Its totient is φ = 31995690678.

The previous prime is 31995690677. The next prime is 31995690739. The reversal of 31995690679 is 97609659913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31995690679 - 2¹ = 31995690677 is a prime.

Together with 31995690677, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31995690679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31995690677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15997845339 + 15997845340.

It is an arithmetic number, because the mean of its divisors is an integer number (15997845340).

Almost surely, 2^31995690679 is an apocalyptic number.

31995690679 is a deficient number, since it is larger than the sum of its proper divisors (1).

31995690679 is an equidigital number, since it uses as much as digits as its factorization.

31995690679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24800580, while the sum is 64.

The spelling of 31995690679 in words is "thirty-one billion, nine hundred ninety-five million, six hundred ninety thousand, six hundred seventy-nine".