31607313173 has 2 divisors, whose sum is σ = 31607313174. Its totient is φ = 31607313172.

The previous prime is 31607313169. The next prime is 31607313187. The reversal of 31607313173 is 37131370613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24579341284 + 7027971889 = 156778^2 + 83833^2 .

It is a cyclic number.

It is not a de Polignac number, because 31607313173 - 2² = 31607313169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31607313113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15803656586 + 15803656587.

It is an arithmetic number, because the mean of its divisors is an integer number (15803656587).

Almost surely, 2^31607313173 is an apocalyptic number.

It is an amenable number.

31607313173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31607313173 is an equidigital number, since it uses as much as digits as its factorization.

31607313173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 35.

Adding to 31607313173 its reverse (37131370613), we get a palindrome (68738683786).

The spelling of 31607313173 in words is "thirty-one billion, six hundred seven million, three hundred thirteen thousand, one hundred seventy-three".