205189 has 4 divisors (see below), whose sum is σ = 211840. Its totient is φ = 198540.

The previous prime is 205187. The next prime is 205201. The reversal of 205189 is 981502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205189 - 2¹ = 205187 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3279 + ... + 3340.

It is an arithmetic number, because the mean of its divisors is an integer number (52960).

2²⁰⁵¹⁸⁹ is an apocalyptic number.

It is an amenable number.

205189 is a deficient number, since it is larger than the sum of its proper divisors (6651).

205189 is an equidigital number, since it uses as much as digits as its factorization.

205189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 205189 is about 452.9779244069. The cubic root of 205189 is about 58.9818003810.

The spelling of 205189 in words is "two hundred five thousand, one hundred eighty-nine".