205559 has 2 divisors, whose sum is σ = 205560. Its totient is φ = 205558.

The previous prime is 205553. The next prime is 205589. The reversal of 205559 is 955502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102779 + 102780.

It is an arithmetic number, because the mean of its divisors is an integer number (102780).

2²⁰⁵⁵⁵⁹ is an apocalyptic number.

205559 is a deficient number, since it is larger than the sum of its proper divisors (1).

205559 is an equidigital number, since it uses as much as digits as its factorization.

205559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 205559 is about 453.3861488841. The cubic root of 205559 is about 59.0172313933.

The spelling of 205559 in words is "two hundred five thousand, five hundred fifty-nine".