22509809 has 4 divisors (see below), whose sum is σ = 25725504. Its totient is φ = 19294116.

The previous prime is 22509797. The next prime is 22509827. The reversal of 22509809 is 90890522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22509809 - 2²⁰ = 21461233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22569809) 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, 1607837 + ... + 1607850.

It is an arithmetic number, because the mean of its divisors is an integer number (6431376).

Almost surely, 2^22509809 is an apocalyptic number.

It is an amenable number.

22509809 is a deficient number, since it is larger than the sum of its proper divisors (3215695).

22509809 is an equidigital number, since it uses as much as digits as its factorization.

22509809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215694.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 22509809 is about 4744.4503369727. The cubic root of 22509809 is about 282.3518276925.

The spelling of 22509809 in words is "twenty-two million, five hundred nine thousand, eight hundred nine".