631087 has 4 divisors (see below), whose sum is σ = 633040. Its totient is φ = 629136.

The previous prime is 631061. The next prime is 631121. The reversal of 631087 is 780136.

631087 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 a de Polignac number, because none of the positive numbers 2^k-631087 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 (631187) 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, 363 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (158260).

2⁶³¹⁰⁸⁷ is an apocalyptic number.

631087 is a deficient number, since it is larger than the sum of its proper divisors (1953).

631087 is a wasteful number, since it uses less digits than its factorization.

631087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 631087 is about 794.4098438464. The cubic root of 631087 is about 85.7754643920.

The spelling of 631087 in words is "six hundred thirty-one thousand, eighty-seven".