205049 has 4 divisors (see below), whose sum is σ = 220836. Its totient is φ = 189264.

The previous prime is 205043. The next prime is 205063. The reversal of 205049 is 940502.

205049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940502 = 2 ⋅470251.

It can be written as a sum of positive squares in 2 ways, for example, as 71824 + 133225 = 268^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 205049 - 2⁴ = 205033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205049.

It is not an unprimeable number, because it can be changed into a prime (205043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7874 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (55209).

2²⁰⁵⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

205049 is a deficient number, since it is larger than the sum of its proper divisors (15787).

205049 is a wasteful number, since it uses less digits than its factorization.

205049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15786.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 205049 is about 452.8233651215. The cubic root of 205049 is about 58.9683829451.

The spelling of 205049 in words is "two hundred five thousand, forty-nine".