631489 has 4 divisors (see below), whose sum is σ = 633556. Its totient is φ = 629424.

The previous prime is 631487. The next prime is 631507. The reversal of 631489 is 984136.

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 291600 + 339889 = 540^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 631489 - 2¹ = 631487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631489.

It is not an unprimeable number, because it can be changed into a prime (631483) 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, 474 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (158389).

2⁶³¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

631489 is a deficient number, since it is larger than the sum of its proper divisors (2067).

631489 is a wasteful number, since it uses less digits than its factorization.

631489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066.

The product of its digits is 5184, while the sum is 31.

The square root of 631489 is about 794.6628215791. The cubic root of 631489 is about 85.7936734069.

The spelling of 631489 in words is "six hundred thirty-one thousand, four hundred eighty-nine".