631352921 has 8 divisors (see below), whose sum is σ = 665597184. Its totient is φ = 597674880.

The previous prime is 631352899. The next prime is 631352963. The reversal of 631352921 is 129253136.

631352921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 631352921 - 2²² = 627158617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631352021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139265 + ... + 143726.

It is an arithmetic number, because the mean of its divisors is an integer number (83199648).

Almost surely, 2^631352921 is an apocalyptic number.

It is an amenable number.

631352921 is a deficient number, since it is larger than the sum of its proper divisors (34244263).

631352921 is a wasteful number, since it uses less digits than its factorization.

631352921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283111.

The product of its digits is 9720, while the sum is 32.

The square root of 631352921 is about 25126.7371737757. The cubic root of 631352921 is about 857.8751043021.

The spelling of 631352921 in words is "six hundred thirty-one million, three hundred fifty-two thousand, nine hundred twenty-one".