631285 has 4 divisors (see below), whose sum is σ = 757548. Its totient is φ = 505024.

The previous prime is 631273. The next prime is 631291. The reversal of 631285 is 582136.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 358801 + 272484 = 599^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 631285 - 2⁷ = 631157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63124 + ... + 63133.

It is an arithmetic number, because the mean of its divisors is an integer number (189387).

2⁶³¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

631285 is a deficient number, since it is larger than the sum of its proper divisors (126263).

631285 is a wasteful number, since it uses less digits than its factorization.

631285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126262.

The product of its digits is 1440, while the sum is 25.

The square root of 631285 is about 794.5344548854. The cubic root of 631285 is about 85.7844339774.

The spelling of 631285 in words is "six hundred thirty-one thousand, two hundred eighty-five".