256603273 has 2 divisors, whose sum is σ = 256603274. Its totient is φ = 256603272.

The previous prime is 256603261. The next prime is 256603283. The reversal of 256603273 is 372306652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210743289 + 45859984 = 14517^2 + 6772^2 .

It is a cyclic number.

It is not a de Polignac number, because 256603273 - 2⁵ = 256603241 is a prime.

It is not a weakly prime, because it can be changed into another prime (256603283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128301636 + 128301637.

It is an arithmetic number, because the mean of its divisors is an integer number (128301637).

Almost surely, 2^256603273 is an apocalyptic number.

It is an amenable number.

256603273 is a deficient number, since it is larger than the sum of its proper divisors (1).

256603273 is an equidigital number, since it uses as much as digits as its factorization.

256603273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 256603273 is about 16018.8411878013. The cubic root of 256603273 is about 635.4587983621.

The spelling of 256603273 in words is "two hundred fifty-six million, six hundred three thousand, two hundred seventy-three".