631994790361 has 9 divisors (see below), whose sum is σ = 694681571829. Its totient is φ = 574532768700.

The previous prime is 631994790341. The next prime is 631994790379. The reversal of 631994790361 is 163097499136.

The square root of 631994790361 is 794981.

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

631994790361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 631994790361 - 2⁷ = 631994790233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631994790296 and 631994790305.

It is not an unprimeable number, because it can be changed into a prime (631994790341) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8708656 + ... + 8780926.

Almost surely, 2^631994790361 is an apocalyptic number.

631994790361 is the 794981-st square number.

631994790361 is the 397491-st centered octagonal number.

It is an amenable number.

631994790361 is a deficient number, since it is larger than the sum of its proper divisors (62686781468).

631994790361 is an frugal number, since it uses more digits than its factorization.

631994790361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144564 (or 72282 counting only the distinct ones).

The product of its (nonzero) digits is 6613488, while the sum is 58.

The spelling of 631994790361 in words is "six hundred thirty-one billion, nine hundred ninety-four million, seven hundred ninety thousand, three hundred sixty-one".