809716085 has 4 divisors (see below), whose sum is σ = 971659308. Its totient is φ = 647772864.

The previous prime is 809716067. The next prime is 809716111. The reversal of 809716085 is 580617908.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 387577969 + 422138116 = 19687^2 + 20546^2 .

It is a cyclic number.

It is not a de Polignac number, because 809716085 - 2¹⁶ = 809650549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 80971604 + ... + 80971613.

It is an arithmetic number, because the mean of its divisors is an integer number (242914827).

Almost surely, 2^809716085 is an apocalyptic number.

It is an amenable number.

809716085 is a deficient number, since it is larger than the sum of its proper divisors (161943223).

809716085 is a wasteful number, since it uses less digits than its factorization.

809716085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161943222.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 809716085 is about 28455.5106262390. The cubic root of 809716085 is about 932.0608267232.

The spelling of 809716085 in words is "eight hundred nine million, seven hundred sixteen thousand, eighty-five".