631349631 has 12 divisors (see below), whose sum is σ = 994854120. Its totient is φ = 382636080.

The previous prime is 631349629. The next prime is 631349657. The reversal of 631349631 is 136943136.

631349631 is a `hidden beast` number, since 6 + 3 + 13 + 4 + 9 + 631 = 666.

It is not a de Polignac number, because 631349631 - 2¹ = 631349629 is a prime.

It is a super-2 number, since 2×631349631² = 797204713127672322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631349231) 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, 3188536 + ... + 3188733.

It is an arithmetic number, because the mean of its divisors is an integer number (82904510).

Almost surely, 2^631349631 is an apocalyptic number.

631349631 is a deficient number, since it is larger than the sum of its proper divisors (363504489).

631349631 is a wasteful number, since it uses less digits than its factorization.

631349631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6377286 (or 6377283 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 631349631 is about 25126.6717055801. The cubic root of 631349631 is about 857.8736141614.

The spelling of 631349631 in words is "six hundred thirty-one million, three hundred forty-nine thousand, six hundred thirty-one".