631606899169 has 9 divisors (see below), whose sum is σ = 636360518521. Its totient is φ = 626888545600.

The previous prime is 631606899139. The next prime is 631606899173. The reversal of 631606899169 is 961998606136.

The square root of 631606899169 is 794737.

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

It can be written as a sum of positive squares in 4 ways, for example, as 288342150625 + 343264748544 = 536975^2 + 585888^2 .

It is not a de Polignac number, because 631606899169 - 2⁵ = 631606899137 is a prime.

It is a super-2 number, since 2×631606899169² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631606899169.

It is not an unprimeable number, because it can be changed into a prime (631606899109) by changing a digit.

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, 108876069 + ... + 108881869.

Almost surely, 2^631606899169 is an apocalyptic number.

631606899169 is the 794737-th square number.

631606899169 is the 397369-th centered octagonal number.

It is an amenable number.

631606899169 is a deficient number, since it is larger than the sum of its proper divisors (4753619352).

631606899169 is an frugal number, since it uses more digits than its factorization.

631606899169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11876 (or 5938 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 64.

Multiplying 631606899169 by its sum of digits (64), we get a square (40422841546816 = 6357896²).

The spelling of 631606899169 in words is "six hundred thirty-one billion, six hundred six million, eight hundred ninety-nine thousand, one hundred sixty-nine".