8515185317 has 2 divisors, whose sum is σ = 8515185318. Its totient is φ = 8515185316.

The previous prime is 8515185311. The next prime is 8515185319. The reversal of 8515185317 is 7135815158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7539622561 + 975562756 = 86831^2 + 31234^2 .

It is a cyclic number.

It is not a de Polignac number, because 8515185317 - 2²⁴ = 8498408101 is a prime.

Together with 8515185319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8515185311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4257592658 + 4257592659.

It is an arithmetic number, because the mean of its divisors is an integer number (4257592659).

Almost surely, 2^8515185317 is an apocalyptic number.

It is an amenable number.

8515185317 is a deficient number, since it is larger than the sum of its proper divisors (1).

8515185317 is an equidigital number, since it uses as much as digits as its factorization.

8515185317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 44.

The square root of 8515185317 is about 92277.7617684781. The cubic root of 8515185317 is about 2042.0421461197.

The spelling of 8515185317 in words is "eight billion, five hundred fifteen million, one hundred eighty-five thousand, three hundred seventeen".