31499211979 has 2 divisors, whose sum is σ = 31499211980. Its totient is φ = 31499211978.

The previous prime is 31499211949. The next prime is 31499212039. The reversal of 31499211979 is 97911299413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31499211979 - 2⁹ = 31499211467 is a prime.

It is not a weakly prime, because it can be changed into another prime (31499211949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15749605989 + 15749605990.

It is an arithmetic number, because the mean of its divisors is an integer number (15749605990).

Almost surely, 2^31499211979 is an apocalyptic number.

31499211979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31499211979 is an equidigital number, since it uses as much as digits as its factorization.

31499211979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 55.

The spelling of 31499211979 in words is "thirty-one billion, four hundred ninety-nine million, two hundred eleven thousand, nine hundred seventy-nine".