631312 has 40 divisors (see below), whose sum is σ = 1419552. Its totient is φ = 268800.

The previous prime is 631307. The next prime is 631339. The reversal of 631312 is 213136.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2887 + ... + 3097.

2⁶³¹³¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709776).

631312 is an abundant number, since it is smaller than the sum of its proper divisors (788240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631312 is a wasteful number, since it uses less digits than its factorization.

631312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 241 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 631312 is about 794.5514457856. The cubic root of 631312 is about 85.7856569573.

Adding to 631312 its reverse (213136), we get a palindrome (844448).

The spelling of 631312 in words is "six hundred thirty-one thousand, three hundred twelve".