809109 has 20 divisors (see below), whose sum is σ = 1382304. Its totient is φ = 462024.

The previous prime is 809101. The next prime is 809141. The reversal of 809109 is 901908.

It is not a de Polignac number, because 809109 - 2³ = 809101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

809109 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809101) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 147 + ... + 1280.

2⁸⁰⁹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

809109 is a deficient number, since it is larger than the sum of its proper divisors (573195).

809109 is a wasteful number, since it uses less digits than its factorization.

809109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446 (or 1437 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 809109 is about 899.5048638001. The cubic root of 809109 is about 93.1827830809.

The spelling of 809109 in words is "eight hundred nine thousand, one hundred nine".