2011111110191 has 4 divisors (see below), whose sum is σ = 2011119720912. Its totient is φ = 2011102499472.

The previous prime is 2011111110133. The next prime is 2011111110223. The reversal of 2011111110191 is 1910111111102.

It is a happy number.

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 2011111110191 - 2³⁸ = 1736233203247 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 (2011111112191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3944966 + ... + 4425491.

It is an arithmetic number, because the mean of its divisors is an integer number (502779930228).

Almost surely, 2^{2011111110191} is an apocalyptic number.

2011111110191 is a deficient number, since it is larger than the sum of its proper divisors (8610721).

2011111110191 is an equidigital number, since it uses as much as digits as its factorization.

2011111110191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610720.

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

Adding to 2011111110191 its reverse (1910111111102), we get a palindrome (3921222221293).

The spelling of 2011111110191 in words is "two trillion, eleven billion, one hundred eleven million, one hundred ten thousand, one hundred ninety-one".