2205891 has 12 divisors (see below), whose sum is σ = 3225768. Its totient is φ = 1452384.

The previous prime is 2205887. The next prime is 2205893. The reversal of 2205891 is 1985022.

It is not a de Polignac number, because 2205891 - 2² = 2205887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2205893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 730 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (268814).

2^2205891 is an apocalyptic number.

2205891 is a deficient number, since it is larger than the sum of its proper divisors (1019877).

2205891 is a wasteful number, since it uses less digits than its factorization.

2205891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042 (or 3039 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 2205891 is about 1485.2242254959. The cubic root of 2205891 is about 130.1751288616.

The spelling of 2205891 in words is "two million, two hundred five thousand, eight hundred ninety-one".