815085793 has 2 divisors, whose sum is σ = 815085794. Its totient is φ = 815085792.

The previous prime is 815085787. The next prime is 815085811. The reversal of 815085793 is 397580518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709263424 + 105822369 = 26632^2 + 10287^2 .

It is a cyclic number.

It is not a de Polignac number, because 815085793 - 2²¹ = 812988641 is a prime.

It is not a weakly prime, because it can be changed into another prime (815085743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407542896 + 407542897.

It is an arithmetic number, because the mean of its divisors is an integer number (407542897).

Almost surely, 2^815085793 is an apocalyptic number.

It is an amenable number.

815085793 is a deficient number, since it is larger than the sum of its proper divisors (1).

815085793 is an equidigital number, since it uses as much as digits as its factorization.

815085793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 815085793 is about 28549.7074065567. The cubic root of 815085793 is about 934.1166384972.

The spelling of 815085793 in words is "eight hundred fifteen million, eighty-five thousand, seven hundred ninety-three".