11128809 has 8 divisors (see below), whose sum is σ = 15026560. Its totient is φ = 7325136.

The previous prime is 11128771. The next prime is 11128811. The reversal of 11128809 is 90882111.

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

It is not a de Polignac number, because 11128809 - 2⁷ = 11128681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11128879) 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, 23242 + ... + 23715.

It is an arithmetic number, because the mean of its divisors is an integer number (1878320).

Almost surely, 2^11128809 is an apocalyptic number.

It is an amenable number.

11128809 is a deficient number, since it is larger than the sum of its proper divisors (3897751).

11128809 is an equidigital number, since it uses as much as digits as its factorization.

11128809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47039.

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

The square root of 11128809 is about 3335.9869604062. The cubic root of 11128809 is about 223.2627293464.

It can be divided in two parts, 111 and 28809, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 11128809 in words is "eleven million, one hundred twenty-eight thousand, eight hundred nine".