205169 has 4 divisors (see below), whose sum is σ = 206400. Its totient is φ = 203940.

The previous prime is 205157. The next prime is 205171. The reversal of 205169 is 961502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205169 - 2⁸ = 204913 is a prime.

It is a super-2 number, since 2×205169² = 84188637122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205129) 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, 317 + ... + 714.

It is an arithmetic number, because the mean of its divisors is an integer number (51600).

2²⁰⁵¹⁶⁹ is an apocalyptic number.

It is an amenable number.

205169 is a deficient number, since it is larger than the sum of its proper divisors (1231).

205169 is a wasteful number, since it uses less digits than its factorization.

205169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 205169 is about 452.9558477379. The cubic root of 205169 is about 58.9798839782.

The spelling of 205169 in words is "two hundred five thousand, one hundred sixty-nine".