631668173 has 2 divisors, whose sum is σ = 631668174. Its totient is φ = 631668172.

The previous prime is 631668143. The next prime is 631668211. The reversal of 631668173 is 371866136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631667689 + 484 = 25133^2 + 22^2 .

It is a cyclic number.

It is not a de Polignac number, because 631668173 - 2⁸ = 631667917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631668173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631668143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315834086 + 315834087.

It is an arithmetic number, because the mean of its divisors is an integer number (315834087).

Almost surely, 2^631668173 is an apocalyptic number.

It is an amenable number.

631668173 is a deficient number, since it is larger than the sum of its proper divisors (1).

631668173 is an equidigital number, since it uses as much as digits as its factorization.

631668173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 631668173 is about 25133.0096287731. The cubic root of 631668173 is about 858.0178674762.

The spelling of 631668173 in words is "six hundred thirty-one million, six hundred sixty-eight thousand, one hundred seventy-three".