809994217 has 2 divisors, whose sum is σ = 809994218. Its totient is φ = 809994216.

The previous prime is 809994169. The next prime is 809994253. The reversal of 809994217 is 712499908.

809994217 is digitally balanced in base 2, 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., 706443241 + 103550976 = 26579^2 + 10176^2 .

It is a cyclic number.

It is not a de Polignac number, because 809994217 - 2⁷ = 809994089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (809994517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404997108 + 404997109.

It is an arithmetic number, because the mean of its divisors is an integer number (404997109).

Almost surely, 2^809994217 is an apocalyptic number.

It is an amenable number.

809994217 is a deficient number, since it is larger than the sum of its proper divisors (1).

809994217 is an equidigital number, since it uses as much as digits as its factorization.

809994217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 809994217 is about 28460.3973443801. The cubic root of 809994217 is about 932.1675333703.

The spelling of 809994217 in words is "eight hundred nine million, nine hundred ninety-four thousand, two hundred seventeen".