631881166 has 12 divisors (see below), whose sum is σ = 1102568328. Its totient is φ = 270806172.

The previous prime is 631881161. The next prime is 631881167. The reversal of 631881166 is 661188136.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631881161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3223786 + ... + 3223981.

It is an arithmetic number, because the mean of its divisors is an integer number (91880694).

Almost surely, 2^631881166 is an apocalyptic number.

631881166 is a deficient number, since it is larger than the sum of its proper divisors (470687162).

631881166 is a wasteful number, since it uses less digits than its factorization.

631881166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447783 (or 6447776 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 631881166 is about 25137.2465874845. The cubic root of 631881166 is about 858.1142953532.

The spelling of 631881166 in words is "six hundred thirty-one million, eight hundred eighty-one thousand, one hundred sixty-six".