631205120 has 144 divisors (see below), whose sum is σ = 1861184640. Its totient is φ = 199729152.

The previous prime is 631205063. The next prime is 631205129. The reversal of 631205120 is 21502136.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 631205092 and 631205101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631205129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113771 + ... + 119189.

Almost surely, 2^631205120 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 631205120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930592320).

631205120 is an abundant number, since it is smaller than the sum of its proper divisors (1229979520).

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

631205120 is a wasteful number, since it uses less digits than its factorization.

631205120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460 (or 5446 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 631205120 is about 25123.7958915447. The cubic root of 631205120 is about 857.8081556433.

Adding to 631205120 its reverse (21502136), we get a palindrome (652707256).

The spelling of 631205120 in words is "six hundred thirty-one million, two hundred five thousand, one hundred twenty".