111121110191 has 24 divisors (see below), whose sum is σ = 145259148384. Its totient is φ = 84097379520.

The previous prime is 111121110179. The next prime is 111121110193. The reversal of 111121110191 is 191011121111.

It is a happy number.

It is not a de Polignac number, because 111121110191 - 2¹⁰ = 111121109167 is a prime.

It is a super-2 number, since 2×111121110191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121110193) 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 23 ways as a sum of consecutive naturals, for example, 3777620 + ... + 3806921.

It is an arithmetic number, because the mean of its divisors is an integer number (6052464516).

Almost surely, 2^111121110191 is an apocalyptic number.

111121110191 is a deficient number, since it is larger than the sum of its proper divisors (34138038193).

111121110191 is a wasteful number, since it uses less digits than its factorization.

111121110191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7584591 (or 7584584 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 20.

The spelling of 111121110191 in words is "one hundred eleven billion, one hundred twenty-one million, one hundred ten thousand, one hundred ninety-one".