31722525137 has 2 divisors, whose sum is σ = 31722525138. Its totient is φ = 31722525136.

The previous prime is 31722525119. The next prime is 31722525139. The reversal of 31722525137 is 73152522713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25382543761 + 6339981376 = 159319^2 + 79624^2 .

It is an emirp because it is prime and its reverse (73152522713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31722525137 - 2⁶ = 31722525073 is a prime.

Together with 31722525139, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31722525137.

It is not a weakly prime, because it can be changed into another prime (31722525139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15861262568 + 15861262569.

It is an arithmetic number, because the mean of its divisors is an integer number (15861262569).

Almost surely, 2^31722525137 is an apocalyptic number.

It is an amenable number.

31722525137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31722525137 is an equidigital number, since it uses as much as digits as its factorization.

31722525137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 38.

The spelling of 31722525137 in words is "thirty-one billion, seven hundred twenty-two million, five hundred twenty-five thousand, one hundred thirty-seven".