205161 has 8 divisors (see below), whose sum is σ = 298464. Its totient is φ = 124320.

The previous prime is 205157. The next prime is 205171. The reversal of 205161 is 161502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205161 - 2² = 205157 is a prime.

It is a Curzon number.

205161 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 205161.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205161.

It is not an unprimeable number, because it can be changed into a prime (205111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3076 + ... + 3141.

It is an arithmetic number, because the mean of its divisors is an integer number (37308).

2²⁰⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

205161 is a deficient number, since it is larger than the sum of its proper divisors (93303).

205161 is a wasteful number, since it uses less digits than its factorization.

205161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 205161 is about 452.9470167691. The cubic root of 205161 is about 58.9791173822.

Adding to 205161 its reverse (161502), we get a palindrome (366663).

It can be divided in two parts, 2051 and 61, that added together give a palindrome (2112).

The spelling of 205161 in words is "two hundred five thousand, one hundred sixty-one".