809099 has 4 divisors (see below), whose sum is σ = 818280. Its totient is φ = 799920.

The previous prime is 809093. The next prime is 809101. The reversal of 809099 is 990908.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4457 + ... + 4634.

It is an arithmetic number, because the mean of its divisors is an integer number (204570).

2⁸⁰⁹⁰⁹⁹ is an apocalyptic number.

809099 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

809099 is a deficient number, since it is larger than the sum of its proper divisors (9181).

809099 is an equidigital number, since it uses as much as digits as its factorization.

809099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9180.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 809099 is about 899.4993051693. The cubic root of 809099 is about 93.1823991888.

The spelling of 809099 in words is "eight hundred nine thousand, ninety-nine".