2005591 has 4 divisors (see below), whose sum is σ = 2292112. Its totient is φ = 1719072.

The previous prime is 2005579. The next prime is 2005613. The reversal of 2005591 is 1955002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2005591 - 2⁵ = 2005559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143250 + ... + 143263.

It is an arithmetic number, because the mean of its divisors is an integer number (573028).

2^2005591 is an apocalyptic number.

2005591 is a deficient number, since it is larger than the sum of its proper divisors (286521).

2005591 is an equidigital number, since it uses as much as digits as its factorization.

2005591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286520.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 2005591 is about 1416.1888998294. The cubic root of 2005591 is about 126.1093994016.

It can be divided in two parts, 20055 and 91, that multiplied together give a triangular number (1825005 = T₁₉₁₀).

The spelling of 2005591 in words is "two million, five thousand, five hundred ninety-one".