631289 has 8 divisors (see below), whose sum is σ = 654720. Its totient is φ = 608400.

The previous prime is 631273. The next prime is 631291. The reversal of 631289 is 982136.

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 631289 - 2⁴ = 631273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631229) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4754 + ... + 4884.

It is an arithmetic number, because the mean of its divisors is an integer number (81840).

2⁶³¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

631289 is a deficient number, since it is larger than the sum of its proper divisors (23431).

631289 is a wasteful number, since it uses less digits than its factorization.

631289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271.

The product of its digits is 2592, while the sum is 29.

The square root of 631289 is about 794.5369720787. The cubic root of 631289 is about 85.7846151618.

The spelling of 631289 in words is "six hundred thirty-one thousand, two hundred eighty-nine".