256222873 has 2 divisors, whose sum is σ = 256222874. Its totient is φ = 256222872.

The previous prime is 256222727. The next prime is 256222907. The reversal of 256222873 is 378222652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217621504 + 38601369 = 14752^2 + 6213^2 .

It is a cyclic number.

It is not a de Polignac number, because 256222873 - 2²⁵ = 222668441 is a prime.

It is a super-3 number, since 3×256222873³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (256222573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128111436 + 128111437.

It is an arithmetic number, because the mean of its divisors is an integer number (128111437).

Almost surely, 2^256222873 is an apocalyptic number.

It is an amenable number.

256222873 is a deficient number, since it is larger than the sum of its proper divisors (1).

256222873 is an equidigital number, since it uses as much as digits as its factorization.

256222873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 37.

The square root of 256222873 is about 16006.9632660289. The cubic root of 256222873 is about 635.1446323576.

The spelling of 256222873 in words is "two hundred fifty-six million, two hundred twenty-two thousand, eight hundred seventy-three".