631560 has 64 divisors (see below), whose sum is σ = 2001600. Its totient is φ = 158976.

The previous prime is 631559. The next prime is 631573. The reversal of 631560 is 65136.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631560.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2142 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (31275).

2⁶³¹⁵⁶⁰ is an apocalyptic number.

631560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000800).

631560 is an abundant number, since it is smaller than the sum of its proper divisors (1370040).

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

631560 is a wasteful number, since it uses less digits than its factorization.

631560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 631560 is about 794.7074933584. The cubic root of 631560 is about 85.7968886239.

Adding to 631560 its reverse (65136), we get a palindrome (696696).

The spelling of 631560 in words is "six hundred thirty-one thousand, five hundred sixty".