631651679 has 12 divisors (see below), whose sum is σ = 658723464. Its totient is φ = 605247984.

The previous prime is 631651673. The next prime is 631651733. The reversal of 631651679 is 976156136.

It is not a de Polignac number, because 631651679 - 2¹⁶ = 631586143 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 (631651673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164192 + ... + 167994.

It is an arithmetic number, because the mean of its divisors is an integer number (54893622).

Almost surely, 2^631651679 is an apocalyptic number.

631651679 is a deficient number, since it is larger than the sum of its proper divisors (27071785).

631651679 is an equidigital number, since it uses as much as digits as its factorization.

631651679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974 (or 3907 counting only the distinct ones).

The product of its digits is 204120, while the sum is 44.

The square root of 631651679 is about 25132.6814924313. The cubic root of 631651679 is about 858.0103992777.

The spelling of 631651679 in words is "six hundred thirty-one million, six hundred fifty-one thousand, six hundred seventy-nine".