31985047979 has 2 divisors, whose sum is σ = 31985047980. Its totient is φ = 31985047978.

The previous prime is 31985047949. The next prime is 31985048119. The reversal of 31985047979 is 97974058913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31985047979 - 2²⁰ = 31983999403 is a prime.

It is not a weakly prime, because it can be changed into another prime (31985047949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15992523989 + 15992523990.

It is an arithmetic number, because the mean of its divisors is an integer number (15992523990).

Almost surely, 2^31985047979 is an apocalyptic number.

31985047979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31985047979 is an equidigital number, since it uses as much as digits as its factorization.

31985047979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The spelling of 31985047979 in words is "thirty-one billion, nine hundred eighty-five million, forty-seven thousand, nine hundred seventy-nine".