11112809 has 2 divisors, whose sum is σ = 11112810. Its totient is φ = 11112808.

The previous prime is 11112769. The next prime is 11112811. The reversal of 11112809 is 90821111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7997584 + 3115225 = 2828^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112809 - 2¹⁶ = 11047273 is a prime.

Together with 11112811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11112859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556404 + 5556405.

It is an arithmetic number, because the mean of its divisors is an integer number (5556405).

Almost surely, 2^11112809 is an apocalyptic number.

It is an amenable number.

11112809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112809 is an equidigital number, since it uses as much as digits as its factorization.

11112809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 11112809 is about 3333.5880069379. The cubic root of 11112809 is about 223.1556823428.

The spelling of 11112809 in words is "eleven million, one hundred twelve thousand, eight hundred nine".