8515993 has 2 divisors, whose sum is σ = 8515994. Its totient is φ = 8515992.

The previous prime is 8515967. The next prime is 8515999. The reversal of 8515993 is 3995158.

8515993 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8311689 + 204304 = 2883^2 + 452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8515993 is a prime.

It is not a weakly prime, because it can be changed into another prime (8515999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4257996 + 4257997.

It is an arithmetic number, because the mean of its divisors is an integer number (4257997).

Almost surely, 2^8515993 is an apocalyptic number.

It is an amenable number.

8515993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8515993 is an equidigital number, since it uses as much as digits as its factorization.

8515993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 40.

The square root of 8515993 is about 2918.2174353533. The cubic root of 8515993 is about 204.2106708057.

The spelling of 8515993 in words is "eight million, five hundred fifteen thousand, nine hundred ninety-three".