631671623 has 4 divisors (see below), whose sum is σ = 689096328. Its totient is φ = 574246920.

The previous prime is 631671619. The next prime is 631671661. The reversal of 631671623 is 326176136.

631671623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631671623 - 2² = 631671619 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 (631671223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28712336 + ... + 28712357.

It is an arithmetic number, because the mean of its divisors is an integer number (172274082).

Almost surely, 2^631671623 is an apocalyptic number.

631671623 is a deficient number, since it is larger than the sum of its proper divisors (57424705).

631671623 is a wasteful number, since it uses less digits than its factorization.

631671623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57424704.

The product of its digits is 27216, while the sum is 35.

The square root of 631671623 is about 25133.0782635156. The cubic root of 631671623 is about 858.0194295602.

The spelling of 631671623 in words is "six hundred thirty-one million, six hundred seventy-one thousand, six hundred twenty-three".