31311324139 has 2 divisors, whose sum is σ = 31311324140. Its totient is φ = 31311324138.

The previous prime is 31311324097. The next prime is 31311324203. The reversal of 31311324139 is 93142311313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31311324139 - 2⁹ = 31311323627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31311324139.

It is not a weakly prime, because it can be changed into another prime (31311324739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655662069 + 15655662070.

It is an arithmetic number, because the mean of its divisors is an integer number (15655662070).

Almost surely, 2^31311324139 is an apocalyptic number.

31311324139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311324139 is an equidigital number, since it uses as much as digits as its factorization.

31311324139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The spelling of 31311324139 in words is "thirty-one billion, three hundred eleven million, three hundred twenty-four thousand, one hundred thirty-nine".