256205 has 4 divisors (see below), whose sum is σ = 307452. Its totient is φ = 204960.

The previous prime is 256199. The next prime is 256211. The reversal of 256205 is 502652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (256199) and next prime (256211).

It can be written as a sum of positive squares in 2 ways, for example, as 98596 + 157609 = 314^2 + 397^2 .

It is not a de Polignac number, because 256205 - 2⁴ = 256189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25616 + ... + 25625.

It is an arithmetic number, because the mean of its divisors is an integer number (76863).

2²⁵⁶²⁰⁵ is an apocalyptic number.

It is an amenable number.

256205 is a deficient number, since it is larger than the sum of its proper divisors (51247).

256205 is an equidigital number, since it uses as much as digits as its factorization.

256205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51246.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 256205 is about 506.1669684995. The cubic root of 256205 is about 63.5129863700.

Adding to 256205 its reverse (502652), we get a palindrome (758857).

The spelling of 256205 in words is "two hundred fifty-six thousand, two hundred five".