31516374139 has 2 divisors, whose sum is σ = 31516374140. Its totient is φ = 31516374138.

The previous prime is 31516374079. The next prime is 31516374163. The reversal of 31516374139 is 93147361513.

It is a strong prime.

It is an emirp because it is prime and its reverse (93147361513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31516374139 - 2⁷ = 31516374011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31516374095 and 31516374104.

It is not a weakly prime, because it can be changed into another prime (31516374739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15758187069 + 15758187070.

It is an arithmetic number, because the mean of its divisors is an integer number (15758187070).

Almost surely, 2^31516374139 is an apocalyptic number.

31516374139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31516374139 is an equidigital number, since it uses as much as digits as its factorization.

31516374139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The spelling of 31516374139 in words is "thirty-one billion, five hundred sixteen million, three hundred seventy-four thousand, one hundred thirty-nine".