317945993689 has 9 divisors (see below), whose sum is σ = 324088625343. Its totient is φ = 311917691592.

The previous prime is 317945993669. The next prime is 317945993693. The reversal of 317945993689 is 986399549713.

The square root of 317945993689 is 563867.

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., 229206350025 + 88739643664 = 478755^2 + 297892^2 .

It is not a de Polignac number, because 317945993689 - 2¹⁵ = 317945960921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317945993669) 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, 29879632 + ... + 29890270.

Almost surely, 2^317945993689 is an apocalyptic number.

317945993689 is the 563867-th square number.

317945993689 is the 281934-th centered octagonal number.

It is an amenable number.

317945993689 is a deficient number, since it is larger than the sum of its proper divisors (6142631654).

317945993689 is an frugal number, since it uses more digits than its factorization.

317945993689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21384 (or 10692 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 73.

The spelling of 317945993689 in words is "three hundred seventeen billion, nine hundred forty-five million, nine hundred ninety-three thousand, six hundred eighty-nine".