8191115617 has 2 divisors, whose sum is σ = 8191115618. Its totient is φ = 8191115616.

The previous prime is 8191115591. The next prime is 8191115641. The reversal of 8191115617 is 7165111918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5561579776 + 2629535841 = 74576^2 + 51279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8191115617 is a prime.

It is a super-3 number, since 3×8191115617³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 8191115617.

It is not a weakly prime, because it can be changed into another prime (8191115687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4095557808 + 4095557809.

It is an arithmetic number, because the mean of its divisors is an integer number (4095557809).

Almost surely, 2^8191115617 is an apocalyptic number.

It is an amenable number.

8191115617 is a deficient number, since it is larger than the sum of its proper divisors (1).

8191115617 is an equidigital number, since it uses as much as digits as its factorization.

8191115617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 40.

The square root of 8191115617 is about 90504.7822880095. The cubic root of 8191115617 is about 2015.8011347239.

The spelling of 8191115617 in words is "eight billion, one hundred ninety-one million, one hundred fifteen thousand, six hundred seventeen".