205553 has 2 divisors, whose sum is σ = 205554. Its totient is φ = 205552.

The previous prime is 205549. The next prime is 205559. The reversal of 205553 is 355502.

205553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107584 + 97969 = 328^2 + 313^2 .

It is a cyclic number.

It is not a de Polignac number, because 205553 - 2² = 205549 is a prime.

It is not a weakly prime, because it can be changed into another prime (205559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102776 + 102777.

It is an arithmetic number, because the mean of its divisors is an integer number (102777).

2²⁰⁵⁵⁵³ is an apocalyptic number.

It is an amenable number.

205553 is a deficient number, since it is larger than the sum of its proper divisors (1).

205553 is an equidigital number, since it uses as much as digits as its factorization.

205553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 205553 is about 453.3795319597. The cubic root of 205553 is about 59.0166571756.

The spelling of 205553 in words is "two hundred five thousand, five hundred fifty-three".