205549 has 2 divisors, whose sum is σ = 205550. Its totient is φ = 205548.

The previous prime is 205537. The next prime is 205553. The reversal of 205549 is 945502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126025 + 79524 = 355^2 + 282^2 .

It is a cyclic number.

It is not a de Polignac number, because 205549 - 2⁷ = 205421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102774 + 102775.

It is an arithmetic number, because the mean of its divisors is an integer number (102775).

2²⁰⁵⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

205549 is a deficient number, since it is larger than the sum of its proper divisors (1).

205549 is an equidigital number, since it uses as much as digits as its factorization.

205549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 205549 is about 453.3751206231. The cubic root of 205549 is about 59.0162743576.

The spelling of 205549 in words is "two hundred five thousand, five hundred forty-nine".