205155 has 24 divisors (see below), whose sum is σ = 366912. Its totient is φ = 105984.

The previous prime is 205151. The next prime is 205157. The reversal of 205155 is 551502.

It is not a de Polignac number, because 205155 - 2² = 205151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2067 + ... + 2163.

It is an arithmetic number, because the mean of its divisors is an integer number (15288).

2²⁰⁵¹⁵⁵ is an apocalyptic number.

205155 is a deficient number, since it is larger than the sum of its proper divisors (161757).

205155 is a wasteful number, since it uses less digits than its factorization.

205155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 205155 is about 452.9403934294. The cubic root of 205155 is about 58.9785424221.

Adding to 205155 its reverse (551502), we get a palindrome (756657).

The spelling of 205155 in words is "two hundred five thousand, one hundred fifty-five".