631021120 has 56 divisors (see below), whose sum is σ = 1551115008. Its totient is φ = 244262400.

The previous prime is 631021117. The next prime is 631021159. The reversal of 631021120 is 21120136.

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

It is a junction number, because it is equal to n+sod(n) for n = 631021094 and 631021103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21886 + ... + 41725.

Almost surely, 2^631021120 is an apocalyptic number.

It is an amenable number.

631021120 is an abundant number, since it is smaller than the sum of its proper divisors (920093888).

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

631021120 is a wasteful number, since it uses less digits than its factorization.

631021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63659 (or 63649 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 631021120 is about 25120.1337576057. The cubic root of 631021120 is about 857.7247955041.

Adding to 631021120 its reverse (21120136), we get a palindrome (652141256).

The spelling of 631021120 in words is "six hundred thirty-one million, twenty-one thousand, one hundred twenty".