2108991 has 8 divisors (see below), whose sum is σ = 2824624. Its totient is φ = 1399680.

The previous prime is 2108987. The next prime is 2108993. The reversal of 2108991 is 1998012.

2108991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2108991 - 2² = 2108987 is a prime.

It is a Duffinian number.

2108991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108993) 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 in 7 ways as a sum of consecutive naturals, for example, 736 + ... + 2181.

It is an arithmetic number, because the mean of its divisors is an integer number (353078).

2^2108991 is an apocalyptic number.

2108991 is a deficient number, since it is larger than the sum of its proper divisors (715633).

2108991 is a wasteful number, since it uses less digits than its factorization.

2108991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2108991 is about 1452.2365509792. The cubic root of 2108991 is about 128.2404132379.

The spelling of 2108991 in words is "two million, one hundred eight thousand, nine hundred ninety-one".