11891101111 has 4 divisors (see below), whose sum is σ = 11891962512. Its totient is φ = 11890239712.

The previous prime is 11891101109. The next prime is 11891101121. The reversal of 11891101111 is 11110119811.

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 11891101111 - 2¹ = 11891101109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11891101121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409651 + ... + 437716.

It is an arithmetic number, because the mean of its divisors is an integer number (2972990628).

Almost surely, 2^11891101111 is an apocalyptic number.

11891101111 is a deficient number, since it is larger than the sum of its proper divisors (861401).

11891101111 is an equidigital number, since it uses as much as digits as its factorization.

11891101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861400.

The product of its (nonzero) digits is 72, while the sum is 25.

The spelling of 11891101111 in words is "eleven billion, eight hundred ninety-one million, one hundred one thousand, one hundred eleven".