8513993 has 2 divisors, whose sum is σ = 8513994. Its totient is φ = 8513992.

The previous prime is 8513987. The next prime is 8514013. The reversal of 8513993 is 3993158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7689529 + 824464 = 2773^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 8513993 - 2⁴ = 8513977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8513693) 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, 4256996 + 4256997.

It is an arithmetic number, because the mean of its divisors is an integer number (4256997).

Almost surely, 2^8513993 is an apocalyptic number.

It is an amenable number.

8513993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8513993 is an equidigital number, since it uses as much as digits as its factorization.

8513993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 8513993 is about 2917.8747402862. The cubic root of 8513993 is about 204.1946831098.

The spelling of 8513993 in words is "eight million, five hundred thirteen thousand, nine hundred ninety-three".