256872223 has 2 divisors, whose sum is σ = 256872224. Its totient is φ = 256872222.

The previous prime is 256872173. The next prime is 256872251. The reversal of 256872223 is 322278652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256872223 - 2¹³ = 256864031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256872263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128436111 + 128436112.

It is an arithmetic number, because the mean of its divisors is an integer number (128436112).

Almost surely, 2^256872223 is an apocalyptic number.

256872223 is a deficient number, since it is larger than the sum of its proper divisors (1).

256872223 is an equidigital number, since it uses as much as digits as its factorization.

256872223 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 256872223 is about 16027.2337912692. The cubic root of 256872223 is about 635.6807323572.

It can be divided in two parts, 256872 and 223, that multiplied together give a triangular number (57282456 = T₁₀₇₀₃).

The spelling of 256872223 in words is "two hundred fifty-six million, eight hundred seventy-two thousand, two hundred twenty-three".