631512 has 72 divisors (see below), whose sum is σ = 2000700. Its totient is φ = 179424.

The previous prime is 631507. The next prime is 631513. The reversal of 631512 is 215136.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×631512² = 797614812288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631513) by changing a digit.

631512 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3439 + ... + 3617.

2⁶³¹⁵¹² 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 631512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000350).

631512 is an abundant number, since it is smaller than the sum of its proper divisors (1369188).

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

631512 is a wasteful number, since it uses less digits than its factorization.

631512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 191 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 631512 is about 794.6772929938. The cubic root of 631512 is about 85.7947149825.

Adding to 631512 its reverse (215136), we get a palindrome (846648).

The spelling of 631512 in words is "six hundred thirty-one thousand, five hundred twelve".