256206205 has 4 divisors (see below), whose sum is σ = 307447452. Its totient is φ = 204964960.

The previous prime is 256206193. The next prime is 256206211. The reversal of 256206205 is 502602652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50168889 + 206037316 = 7083^2 + 14354^2 .

It is not a de Polignac number, because 256206205 - 2⁵ = 256206173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25620616 + ... + 25620625.

It is an arithmetic number, because the mean of its divisors is an integer number (76861863).

Almost surely, 2^256206205 is an apocalyptic number.

It is an amenable number.

256206205 is a deficient number, since it is larger than the sum of its proper divisors (51241247).

256206205 is an equidigital number, since it uses as much as digits as its factorization.

256206205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51241246.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 256206205 is about 16006.4426091496. The cubic root of 256206205 is about 635.1308594260.

Adding to 256206205 its reverse (502602652), we get a palindrome (758808857).

The spelling of 256206205 in words is "two hundred fifty-six million, two hundred six thousand, two hundred five".