108191 has 2 divisors, whose sum is σ = 108192. Its totient is φ = 108190.

The previous prime is 108187. The next prime is 108193. The reversal of 108191 is 191801.

It is a strong prime.

It is an emirp because it is prime and its reverse (191801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108191 - 2² = 108187 is a prime.

Together with 108193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54095 + 54096.

It is an arithmetic number, because the mean of its divisors is an integer number (54096).

2¹⁰⁸¹⁹¹ is an apocalyptic number.

108191 is a deficient number, since it is larger than the sum of its proper divisors (1).

108191 is an equidigital number, since it uses as much as digits as its factorization.

108191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 108191 is about 328.9240033807. The cubic root of 108191 is about 47.6500885074.

Adding to 108191 its reverse (191801), we get a palindrome (299992).

The spelling of 108191 in words is "one hundred eight thousand, one hundred ninety-one".