631685379 has 16 divisors (see below), whose sum is σ = 907496352. Its totient is φ = 388531968.

The previous prime is 631685377. The next prime is 631685389. The reversal of 631685379 is 973586136.

It is a happy number.

It is not a de Polignac number, because 631685379 - 2¹ = 631685377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631685377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124537 + ... + 129509.

It is an arithmetic number, because the mean of its divisors is an integer number (56718522).

Almost surely, 2^631685379 is an apocalyptic number.

631685379 is a deficient number, since it is larger than the sum of its proper divisors (275810973).

631685379 is a wasteful number, since it uses less digits than its factorization.

631685379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8246.

The product of its digits is 816480, while the sum is 48.

The square root of 631685379 is about 25133.3519252805. The cubic root of 631685379 is about 858.0256579175.

The spelling of 631685379 in words is "six hundred thirty-one million, six hundred eighty-five thousand, three hundred seventy-nine".