11111113888909 has 2 divisors, whose sum is σ = 11111113888910. Its totient is φ = 11111113888908.

The previous prime is 11111113888817. The next prime is 11111113888933. The reversal of 11111113888909 is 90988831111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7356316336009 + 3754797552900 = 2712253^2 + 1937730^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111113888909 - 2⁹ = 11111113888397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111113886909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555556944454 + 5555556944455.

It is an arithmetic number, because the mean of its divisors is an integer number (5555556944455).

Almost surely, 2^{11111113888909} is an apocalyptic number.

It is an amenable number.

11111113888909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111113888909 is an equidigital number, since it uses as much as digits as its factorization.

11111113888909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 52.

The spelling of 11111113888909 in words is "eleven trillion, one hundred eleven billion, one hundred thirteen million, eight hundred eighty-eight thousand, nine hundred nine".