31636669689 has 15 divisors (see below), whose sum is σ = 47262107893. Its totient is φ = 21090045924.

The previous prime is 31636669681. The next prime is 31636669693. The reversal of 31636669689 is 98696663613.

The square root of 31636669689 is 177867.

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

It is not a de Polignac number, because 31636669689 - 2³ = 31636669681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31636669681) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1590922 + ... + 1610684.

Almost surely, 2^31636669689 is an apocalyptic number.

31636669689 is the 177867-th square number.

31636669689 is the 88934-th centered octagonal number.

It is an amenable number.

31636669689 is a deficient number, since it is larger than the sum of its proper divisors (15625438204).

31636669689 is an frugal number, since it uses more digits than its factorization.

31636669689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39538 (or 19766 counting only the distinct ones).

The product of its digits is 45349632, while the sum is 63.

The spelling of 31636669689 in words is "thirty-one billion, six hundred thirty-six million, six hundred sixty-nine thousand, six hundred eighty-nine".