111342191 has 2 divisors, whose sum is σ = 111342192. Its totient is φ = 111342190.

The previous prime is 111342181. The next prime is 111342211. The reversal of 111342191 is 191243111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111342191 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 (111342151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55671095 + 55671096.

It is an arithmetic number, because the mean of its divisors is an integer number (55671096).

Almost surely, 2^111342191 is an apocalyptic number.

111342191 is a deficient number, since it is larger than the sum of its proper divisors (1).

111342191 is an equidigital number, since it uses as much as digits as its factorization.

111342191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

The square root of 111342191 is about 10551.8809223759. The cubic root of 111342191 is about 481.0829008668.

The spelling of 111342191 in words is "one hundred eleven million, three hundred forty-two thousand, one hundred ninety-one".