631166550 has 144 divisors (see below), whose sum is σ = 1845596160. Its totient is φ = 142309440.

The previous prime is 631166539. The next prime is 631166597. The reversal of 631166550 is 55661136.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 580107 + ... + 581193.

It is an arithmetic number, because the mean of its divisors is an integer number (12816640).

Almost surely, 2^631166550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631166550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922798080).

631166550 is an abundant number, since it is smaller than the sum of its proper divisors (1214429610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631166550 is a wasteful number, since it uses less digits than its factorization.

631166550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195 (or 1183 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 631166550 is about 25123.0282808423. The cubic root of 631166550 is about 857.7906830693.

The spelling of 631166550 in words is "six hundred thirty-one million, one hundred sixty-six thousand, five hundred fifty".