809047999 has 2 divisors, whose sum is σ = 809048000. Its totient is φ = 809047998.

The previous prime is 809047991. The next prime is 809048029. The reversal of 809047999 is 999740908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809047999 - 2³ = 809047991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809047991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404523999 + 404524000.

It is an arithmetic number, because the mean of its divisors is an integer number (404524000).

Almost surely, 2^809047999 is an apocalyptic number.

809047999 is a deficient number, since it is larger than the sum of its proper divisors (1).

809047999 is an equidigital number, since it uses as much as digits as its factorization.

809047999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 809047999 is about 28443.7690716262. The cubic root of 809047999 is about 931.8044125145.

The spelling of 809047999 in words is "eight hundred nine million, forty-seven thousand, nine hundred ninety-nine".