2108191 has 4 divisors (see below), whose sum is σ = 2111112. Its totient is φ = 2105272.

The previous prime is 2108177. The next prime is 2108231. The reversal of 2108191 is 1918012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2108191 - 2⁵ = 2108159 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108291) 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, 501 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (527778).

2^2108191 is an apocalyptic number.

2108191 is a deficient number, since it is larger than the sum of its proper divisors (2921).

2108191 is a wasteful number, since it uses less digits than its factorization.

2108191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 2108191 is about 1451.9610876329. The cubic root of 2108191 is about 128.2241961140.

The spelling of 2108191 in words is "two million, one hundred eight thousand, one hundred ninety-one".