205551559 has 2 divisors, whose sum is σ = 205551560. Its totient is φ = 205551558.

The previous prime is 205551523. The next prime is 205551569. The reversal of 205551559 is 955155502.

205551559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205551559 - 2⁷ = 205551431 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205551569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102775779 + 102775780.

It is an arithmetic number, because the mean of its divisors is an integer number (102775780).

Almost surely, 2^205551559 is an apocalyptic number.

205551559 is a deficient number, since it is larger than the sum of its proper divisors (1).

205551559 is an equidigital number, since it uses as much as digits as its factorization.

205551559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56250, while the sum is 37.

The square root of 205551559 is about 14337.0694006830. The cubic root of 205551559 is about 590.1651926598.

The spelling of 205551559 in words is "two hundred five million, five hundred fifty-one thousand, five hundred fifty-nine".