11218809 has 8 divisors (see below), whose sum is σ = 17095360. Its totient is φ = 6410736.

The previous prime is 11218787. The next prime is 11218811. The reversal of 11218809 is 90881211.

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

It is a de Polignac number, because none of the positive numbers 2^k-11218809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11218849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267094 + ... + 267135.

It is an arithmetic number, because the mean of its divisors is an integer number (2136920).

Almost surely, 2^11218809 is an apocalyptic number.

It is an amenable number.

11218809 is a deficient number, since it is larger than the sum of its proper divisors (5876551).

11218809 is an equidigital number, since it uses as much as digits as its factorization.

11218809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534239.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 11218809 is about 3349.4490591738. The cubic root of 11218809 is about 223.8629649191.

The spelling of 11218809 in words is "eleven million, two hundred eighteen thousand, eight hundred nine".