205445161 has 4 divisors (see below), whose sum is σ = 205474500. Its totient is φ = 205415824.

The previous prime is 205445159. The next prime is 205445173. The reversal of 205445161 is 161544502.

205445161 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 199685161 + 5760000 = 14131^2 + 2400^2 .

It is a cyclic number.

It is not a de Polignac number, because 205445161 - 2¹ = 205445159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205445761) 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, 2655 + ... + 20443.

It is an arithmetic number, because the mean of its divisors is an integer number (51368625).

Almost surely, 2^205445161 is an apocalyptic number.

It is an amenable number.

205445161 is a deficient number, since it is larger than the sum of its proper divisors (29339).

205445161 is a wasteful number, since it uses less digits than its factorization.

205445161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29338.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 205445161 is about 14333.3583294356. The cubic root of 205445161 is about 590.0633475983.

Adding to 205445161 its reverse (161544502), we get a palindrome (366989663).

The spelling of 205445161 in words is "two hundred five million, four hundred forty-five thousand, one hundred sixty-one".