31722525139 has 2 divisors, whose sum is σ = 31722525140. Its totient is φ = 31722525138.

The previous prime is 31722525137. The next prime is 31722525157. The reversal of 31722525139 is 93152522713.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31722525139 - 2¹ = 31722525137 is a prime.

Together with 31722525137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31722525137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15861262569 + 15861262570.

It is an arithmetic number, because the mean of its divisors is an integer number (15861262570).

Almost surely, 2^31722525139 is an apocalyptic number.

31722525139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31722525139 is an equidigital number, since it uses as much as digits as its factorization.

31722525139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The spelling of 31722525139 in words is "thirty-one billion, seven hundred twenty-two million, five hundred twenty-five thousand, one hundred thirty-nine".