8091809 has 8 divisors (see below), whose sum is σ = 8883552. Its totient is φ = 7309440.

The previous prime is 8091803. The next prime is 8091821. The reversal of 8091809 is 9081908.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8091809 - 2⁸ = 8091553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8091803) 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 in 7 ways as a sum of consecutive naturals, for example, 464 + ... + 4049.

It is an arithmetic number, because the mean of its divisors is an integer number (1110444).

Almost surely, 2^8091809 is an apocalyptic number.

It is an amenable number.

8091809 is a deficient number, since it is larger than the sum of its proper divisors (791743).

8091809 is a wasteful number, since it uses less digits than its factorization.

8091809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 8091809 is about 2844.6105181553. The cubic root of 8091809 is about 200.7621668192.

Subtracting 8091809 from its reverse (9081908), we obtain a palindrome (990099).

The spelling of 8091809 in words is "eight million, ninety-one thousand, eight hundred nine".