2105591 has 2 divisors, whose sum is σ = 2105592. Its totient is φ = 2105590.

The previous prime is 2105567. The next prime is 2105611. The reversal of 2105591 is 1955012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2105591 - 2¹⁰ = 2104567 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 (2105891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052795 + 1052796.

It is an arithmetic number, because the mean of its divisors is an integer number (1052796).

2^2105591 is an apocalyptic number.

2105591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105591 is an equidigital number, since it uses as much as digits as its factorization.

2105591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 2105591 is about 1451.0654706112. The cubic root of 2105591 is about 128.1714621103.

The spelling of 2105591 in words is "two million, one hundred five thousand, five hundred ninety-one".