10809109 has 4 divisors (see below), whose sum is σ = 10826316. Its totient is φ = 10791904.

The previous prime is 10809101. The next prime is 10809133. The reversal of 10809109 is 90190801.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7006609 + 3802500 = 2647^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 10809109 - 2³ = 10809101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10809101) 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 3 ways as a sum of consecutive naturals, for example, 7624 + ... + 8929.

It is an arithmetic number, because the mean of its divisors is an integer number (2706579).

Almost surely, 2^10809109 is an apocalyptic number.

It is an amenable number.

10809109 is a deficient number, since it is larger than the sum of its proper divisors (17207).

10809109 is an equidigital number, since it uses as much as digits as its factorization.

10809109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17206.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 10809109 is about 3287.7209431459. The cubic root of 10809109 is about 221.1040166088.

The spelling of 10809109 in words is "ten million, eight hundred nine thousand, one hundred nine".