631641656 has 16 divisors (see below), whose sum is σ = 1199320800. Its totient is φ = 311822784.

The previous prime is 631641653. The next prime is 631641679. The reversal of 631641656 is 656146136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631641653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499085 + ... + 500348.

It is an arithmetic number, because the mean of its divisors is an integer number (74957550).

Almost surely, 2^631641656 is an apocalyptic number.

It is an amenable number.

631641656 is a deficient number, since it is larger than the sum of its proper divisors (567679144).

631641656 is a wasteful number, since it uses less digits than its factorization.

631641656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999518 (or 999514 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 631641656 is about 25132.4820899170. The cubic root of 631641656 is about 858.0058609728.

The spelling of 631641656 in words is "six hundred thirty-one million, six hundred forty-one thousand, six hundred fifty-six".