631147984 has 20 divisors (see below), whose sum is σ = 1294782084. Its totient is φ = 297010688.

The previous prime is 631147981. The next prime is 631148017. The reversal of 631147984 is 489741136.

631147984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 411278400 + 219869584 = 20280^2 + 14828^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 631147984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631147981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1159927 + ... + 1160470.

Almost surely, 2^631147984 is an apocalyptic number.

It is an amenable number.

631147984 is an abundant number, since it is smaller than the sum of its proper divisors (663634100).

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

631147984 is a wasteful number, since it uses less digits than its factorization.

631147984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320422 (or 2320416 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 631147984 is about 25122.6587764910. The cubic root of 631147984 is about 857.7822722423.

The spelling of 631147984 in words is "six hundred thirty-one million, one hundred forty-seven thousand, nine hundred eighty-four".