11011101809 has 2 divisors, whose sum is σ = 11011101810. Its totient is φ = 11011101808.

The previous prime is 11011101797. The next prime is 11011101833. The reversal of 11011101809 is 90810111011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8643792784 + 2367309025 = 92972^2 + 48655^2 .

It is an emirp because it is prime and its reverse (90810111011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011101809 is a prime.

It is not a weakly prime, because it can be changed into another prime (11011101869) 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, 5505550904 + 5505550905.

It is an arithmetic number, because the mean of its divisors is an integer number (5505550905).

Almost surely, 2^11011101809 is an apocalyptic number.

It is an amenable number.

11011101809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011101809 is an equidigital number, since it uses as much as digits as its factorization.

11011101809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 23.

The spelling of 11011101809 in words is "eleven billion, eleven million, one hundred one thousand, eight hundred nine".