565812161 has 4 divisors (see below), whose sum is σ = 565865172. Its totient is φ = 565759152.

The previous prime is 565812113. The next prime is 565812193. The reversal of 565812161 is 161218565.

It is a happy number.

565812161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 181063936 + 384748225 = 13456^2 + 19615^2 .

It is a cyclic number.

It is not a de Polignac number, because 565812161 - 2¹⁰ = 565811137 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (565832161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4286 + ... + 33911.

It is an arithmetic number, because the mean of its divisors is an integer number (141466293).

Almost surely, 2^565812161 is an apocalyptic number.

It is an amenable number.

565812161 is a deficient number, since it is larger than the sum of its proper divisors (53011).

565812161 is a wasteful number, since it uses less digits than its factorization.

565812161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53010.

The product of its digits is 14400, while the sum is 35.

The square root of 565812161 is about 23786.8064481132. The cubic root of 565812161 is about 827.0988668649.

The spelling of 565812161 in words is "five hundred sixty-five million, eight hundred twelve thousand, one hundred sixty-one".