631887 has 8 divisors (see below), whose sum is σ = 846336. Its totient is φ = 419352.

The previous prime is 631867. The next prime is 631889. The reversal of 631887 is 788136.

631887 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 not a de Polignac number, because 631887 - 2¹⁰ = 630863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631889) 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, 738 + ... + 1344.

It is an arithmetic number, because the mean of its divisors is an integer number (105792).

2⁶³¹⁸⁸⁷ is an apocalyptic number.

631887 is a deficient number, since it is larger than the sum of its proper divisors (214449).

631887 is a wasteful number, since it uses less digits than its factorization.

631887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957.

The product of its digits is 8064, while the sum is 33.

The square root of 631887 is about 794.9132028090. The cubic root of 631887 is about 85.8116936263.

The spelling of 631887 in words is "six hundred thirty-one thousand, eight hundred eighty-seven".