205564841 has 2 divisors, whose sum is σ = 205564842. Its totient is φ = 205564840.

The previous prime is 205564817. The next prime is 205564871. The reversal of 205564841 is 148465502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147744025 + 57820816 = 12155^2 + 7604^2 .

It is a cyclic number.

It is not a de Polignac number, because 205564841 - 2¹⁰ = 205563817 is a prime.

It is not a weakly prime, because it can be changed into another prime (205564871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102782420 + 102782421.

It is an arithmetic number, because the mean of its divisors is an integer number (102782421).

Almost surely, 2^205564841 is an apocalyptic number.

It is an amenable number.

205564841 is a deficient number, since it is larger than the sum of its proper divisors (1).

205564841 is an equidigital number, since it uses as much as digits as its factorization.

205564841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 205564841 is about 14337.5325980449. The cubic root of 205564841 is about 590.1779038344.

The spelling of 205564841 in words is "two hundred five million, five hundred sixty-four thousand, eight hundred forty-one".