111191 has 2 divisors, whose sum is σ = 111192. Its totient is φ = 111190.

The previous prime is 111187. The next prime is 111211. The reversal of 111191 is 191111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111191 - 2² = 111187 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55595 + 55596.

It is an arithmetic number, because the mean of its divisors is an integer number (55596).

2¹¹¹¹⁹¹ is an apocalyptic number.

111191 is a deficient number, since it is larger than the sum of its proper divisors (1).

111191 is an equidigital number, since it uses as much as digits as its factorization.

111191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9, while the sum is 14.

The square root of 111191 is about 333.4531451344. The cubic root of 111191 is about 48.0865048882.

It can be divided in two parts, 1111 and 91, that multiplied together give a palindrome (101101).

The spelling of 111191 in words is "one hundred eleven thousand, one hundred ninety-one".