31972638979 has 2 divisors, whose sum is σ = 31972638980. Its totient is φ = 31972638978.

The previous prime is 31972638977. The next prime is 31972639037. The reversal of 31972638979 is 97983627913.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31972638979 - 2¹ = 31972638977 is a prime.

Together with 31972638977, 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 31972638979.

It is not a weakly prime, because it can be changed into another prime (31972638977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15986319489 + 15986319490.

It is an arithmetic number, because the mean of its divisors is an integer number (15986319490).

Almost surely, 2^31972638979 is an apocalyptic number.

31972638979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31972638979 is an equidigital number, since it uses as much as digits as its factorization.

31972638979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30862944, while the sum is 64.

The spelling of 31972638979 in words is "thirty-one billion, nine hundred seventy-two million, six hundred thirty-eight thousand, nine hundred seventy-nine".