317656721161 has 12 divisors (see below), whose sum is σ = 344053589580. Its totient is φ = 293151593280.

The previous prime is 317656721059. The next prime is 317656721191. The reversal of 317656721161 is 161127656713.

It can be written as a sum of positive squares in 6 ways, for example, as 835210000 + 316821511161 = 28900^2 + 562869^2 .

It is not a de Polignac number, because 317656721161 - 2¹³ = 317656712969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317656721191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 492471 + ... + 936931.

It is an arithmetic number, because the mean of its divisors is an integer number (28671132465).

Almost surely, 2^317656721161 is an apocalyptic number.

It is an amenable number.

317656721161 is a deficient number, since it is larger than the sum of its proper divisors (26396868419).

317656721161 is a wasteful number, since it uses less digits than its factorization.

317656721161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448716 (or 448703 counting only the distinct ones).

The product of its digits is 317520, while the sum is 46.

The spelling of 317656721161 in words is "three hundred seventeen billion, six hundred fifty-six million, seven hundred twenty-one thousand, one hundred sixty-one".