11111113888891 has 4 divisors (see below), whose sum is σ = 11111131638000. Its totient is φ = 11111096139784.

The previous prime is 11111113888817. The next prime is 11111113888909. The reversal of 11111113888891 is 19888831111111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111113888891 - 2³³ = 11102523954299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111113888691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7899856 + ... + 9199453.

It is an arithmetic number, because the mean of its divisors is an integer number (2777782909500).

Almost surely, 2^{11111113888891} is an apocalyptic number.

11111113888891 is a deficient number, since it is larger than the sum of its proper divisors (17749109).

11111113888891 is an equidigital number, since it uses as much as digits as its factorization.

11111113888891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17749108.

The product of its digits is 110592, while the sum is 52.

The spelling of 11111113888891 in words is "eleven trillion, one hundred eleven billion, one hundred thirteen million, eight hundred eighty-eight thousand, eight hundred ninety-one".