631821496384 has 63 divisors (see below), whose sum is σ = 1357811104413. Its totient is φ = 291571767552.

The previous prime is 631821496291. The next prime is 631821496391. The reversal of 631821496384 is 483694128136.

The square root of 631821496384 is 794872.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 93464718400 + 538356777984 = 305720^2 + 733728^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 82662867 + ... + 82670509.

Almost surely, 2^631821496384 is an apocalyptic number.

631821496384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

631821496384 is the 794872-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631821496384

631821496384 is an abundant number, since it is smaller than the sum of its proper divisors (725989608029).

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

631821496384 is an frugal number, since it uses more digits than its factorization.

631821496384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15324 (or 7658 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 55.

The spelling of 631821496384 in words is "six hundred thirty-one billion, eight hundred twenty-one million, four hundred ninety-six thousand, three hundred eighty-four".