631389 has 24 divisors (see below), whose sum is σ = 987552. Its totient is φ = 355680.

The previous prime is 631387. The next prime is 631391. The reversal of 631389 is 983136.

631389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (631387) and next prime (631391).

It is not a de Polignac number, because 631389 - 2¹ = 631387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11887 + ... + 11939.

It is an arithmetic number, because the mean of its divisors is an integer number (41148).

2⁶³¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

631389 is a deficient number, since it is larger than the sum of its proper divisors (356163).

631389 is a wasteful number, since it uses less digits than its factorization.

631389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 86 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 631389 is about 794.5998993204. The cubic root of 631389 is about 85.7891445235.

The spelling of 631389 in words is "six hundred thirty-one thousand, three hundred eighty-nine".