631520 has 24 divisors (see below), whose sum is σ = 1492344. Its totient is φ = 252544.

The previous prime is 631513. The next prime is 631529. The reversal of 631520 is 25136.

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 631520.

It is not an unprimeable number, because it can be changed into a prime (631529) by changing a digit.

631520 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 3 ways as a sum of consecutive naturals, for example, 1814 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (62181).

2⁶³¹⁵²⁰ is an apocalyptic number.

It is an amenable number.

631520 is an abundant number, since it is smaller than the sum of its proper divisors (860824).

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

631520 is a wasteful number, since it uses less digits than its factorization.

631520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962 (or 3954 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 631520 is about 794.6823264676. The cubic root of 631520 is about 85.7950772637.

Adding to 631520 its reverse (25136), we get a palindrome (656656).

The spelling of 631520 in words is "six hundred thirty-one thousand, five hundred twenty".