10809809 has 4 divisors (see below), whose sum is σ = 11102004. Its totient is φ = 10517616.

The previous prime is 10809791. The next prime is 10809811. The reversal of 10809809 is 90890801.

It is a happy number.

10809809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90890801 = 1609 ⋅56489.

It can be written as a sum of positive squares in 2 ways, for example, as 7398400 + 3411409 = 2720^2 + 1847^2 .

It is a cyclic number.

It is not a de Polignac number, because 10809809 - 2⁸ = 10809553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10809829) 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, 146042 + ... + 146115.

It is an arithmetic number, because the mean of its divisors is an integer number (2775501).

Almost surely, 2^10809809 is an apocalyptic number.

It is an amenable number.

10809809 is a deficient number, since it is larger than the sum of its proper divisors (292195).

10809809 is an equidigital number, since it uses as much as digits as its factorization.

10809809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292194.

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

The square root of 10809809 is about 3287.8273981461. The cubic root of 10809809 is about 221.1087894188.

The spelling of 10809809 in words is "ten million, eight hundred nine thousand, eight hundred nine".