11091171809 has 2 divisors, whose sum is σ = 11091171810. Its totient is φ = 11091171808.

The previous prime is 11091171797. The next prime is 11091171851. The reversal of 11091171809 is 90817119011.

It is a happy number.

11091171809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10760950225 + 330221584 = 103735^2 + 18172^2 .

It is a cyclic number.

It is not a de Polignac number, because 11091171809 - 2²⁴ = 11074394593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11091171869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5545585904 + 5545585905.

It is an arithmetic number, because the mean of its divisors is an integer number (5545585905).

Almost surely, 2^11091171809 is an apocalyptic number.

It is an amenable number.

11091171809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11091171809 is an equidigital number, since it uses as much as digits as its factorization.

11091171809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 38.

The spelling of 11091171809 in words is "eleven billion, ninety-one million, one hundred seventy-one thousand, eight hundred nine".