205148161 has 4 divisors (see below), whose sum is σ = 205215300. Its totient is φ = 205081024.

The previous prime is 205148159. The next prime is 205148179. The reversal of 205148161 is 161841502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161841502 = 2 ⋅80920751.

It can be written as a sum of positive squares in 2 ways, for example, as 62489025 + 142659136 = 7905^2 + 11944^2 .

It is a cyclic number.

It is not a de Polignac number, because 205148161 - 2¹ = 205148159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205148131) 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, 28756 + ... + 35173.

It is an arithmetic number, because the mean of its divisors is an integer number (51303825).

Almost surely, 2^205148161 is an apocalyptic number.

It is an amenable number.

205148161 is a deficient number, since it is larger than the sum of its proper divisors (67139).

205148161 is an equidigital number, since it uses as much as digits as its factorization.

205148161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67138.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 205148161 is about 14322.9941353056. The cubic root of 205148161 is about 589.7788704978.

Adding to 205148161 its reverse (161841502), we get a palindrome (366989663).

The spelling of 205148161 in words is "two hundred five million, one hundred forty-eight thousand, one hundred sixty-one".