205334561 has 4 divisors (see below), whose sum is σ = 209208852. Its totient is φ = 201460272.

The previous prime is 205334543. The next prime is 205334567. The reversal of 205334561 is 165433502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135862336 + 69472225 = 11656^2 + 8335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205334561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205334567) 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 in 3 ways as a sum of consecutive naturals, for example, 1937066 + ... + 1937171.

It is an arithmetic number, because the mean of its divisors is an integer number (52302213).

Almost surely, 2^205334561 is an apocalyptic number.

It is an amenable number.

205334561 is a deficient number, since it is larger than the sum of its proper divisors (3874291).

205334561 is an equidigital number, since it uses as much as digits as its factorization.

205334561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874290.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 205334561 is about 14329.4996772393. The cubic root of 205334561 is about 589.9574430666.

The spelling of 205334561 in words is "two hundred five million, three hundred thirty-four thousand, five hundred sixty-one".