2105891 has 2 divisors, whose sum is σ = 2105892. Its totient is φ = 2105890.

The previous prime is 2105881. The next prime is 2105897. The reversal of 2105891 is 1985012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2105891 - 2¹⁰ = 2104867 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2105891.

It is not a weakly prime, because it can be changed into another prime (2105897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052945 + 1052946.

It is an arithmetic number, because the mean of its divisors is an integer number (1052946).

2^2105891 is an apocalyptic number.

2105891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105891 is an equidigital number, since it uses as much as digits as its factorization.

2105891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2105891 is about 1451.1688392465. The cubic root of 2105891 is about 128.1775490177.

The spelling of 2105891 in words is "two million, one hundred five thousand, eight hundred ninety-one".