256746481 has 2 divisors, whose sum is σ = 256746482. Its totient is φ = 256746480.

The previous prime is 256746419. The next prime is 256746491. The reversal of 256746481 is 184647652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256480225 + 266256 = 16015^2 + 516^2 .

It is a cyclic number.

It is not a de Polignac number, because 256746481 - 2⁹ = 256745969 is a prime.

It is a super-2 number, since 2×256746481² = 131837511011766722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256746491) by changing a digit.

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 as a sum of consecutive naturals, namely, 128373240 + 128373241.

It is an arithmetic number, because the mean of its divisors is an integer number (128373241).

Almost surely, 2^256746481 is an apocalyptic number.

It is an amenable number.

256746481 is a deficient number, since it is larger than the sum of its proper divisors (1).

256746481 is an equidigital number, since it uses as much as digits as its factorization.

256746481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 43.

The square root of 256746481 is about 16023.3105505698. The cubic root of 256746481 is about 635.5769910083.

The spelling of 256746481 in words is "two hundred fifty-six million, seven hundred forty-six thousand, four hundred eighty-one".