631668791 has 8 divisors (see below), whose sum is σ = 683232480. Its totient is φ = 580529952.

The previous prime is 631668733. The next prime is 631668797. The reversal of 631668791 is 197866136.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 631668791 - 2¹⁰ = 631667767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631668797) 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 7 ways as a sum of consecutive naturals, for example, 103115 + ... + 109068.

It is an arithmetic number, because the mean of its divisors is an integer number (85404060).

Almost surely, 2^631668791 is an apocalyptic number.

631668791 is a deficient number, since it is larger than the sum of its proper divisors (51563689).

631668791 is a wasteful number, since it uses less digits than its factorization.

631668791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212425.

The product of its digits is 326592, while the sum is 47.

The square root of 631668791 is about 25133.0219233581. The cubic root of 631668791 is about 858.0181472934.

The spelling of 631668791 in words is "six hundred thirty-one million, six hundred sixty-eight thousand, seven hundred ninety-one".