205281 has 8 divisors (see below), whose sum is σ = 304160. Its totient is φ = 136836.

The previous prime is 205267. The next prime is 205297. The reversal of 205281 is 182502.

It is not a de Polignac number, because 205281 - 2¹¹ = 203233 is a prime.

It is a super-2 number, since 2×205281² = 84280577922, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205281.

It is not an unprimeable number, because it can be changed into a prime (205201) 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, 3775 + ... + 3828.

It is an arithmetic number, because the mean of its divisors is an integer number (38020).

2²⁰⁵²⁸¹ is an apocalyptic number.

It is an amenable number.

205281 is a deficient number, since it is larger than the sum of its proper divisors (98879).

205281 is an equidigital number, since it uses as much as digits as its factorization.

205281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7612 (or 7606 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 205281 is about 453.0794632291. The cubic root of 205281 is about 58.9906142304.

Adding to 205281 its reverse (182502), we get a palindrome (387783).

The spelling of 205281 in words is "two hundred five thousand, two hundred eighty-one".