256057481 has 2 divisors, whose sum is σ = 256057482. Its totient is φ = 256057480.

The previous prime is 256057441. The next prime is 256057507. The reversal of 256057481 is 184750652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246961225 + 9096256 = 15715^2 + 3016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256057481 is a prime.

It is a super-2 number, since 2×256057481² = 131130867152130722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (256057441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128028740 + 128028741.

It is an arithmetic number, because the mean of its divisors is an integer number (128028741).

Almost surely, 2^256057481 is an apocalyptic number.

It is an amenable number.

256057481 is a deficient number, since it is larger than the sum of its proper divisors (1).

256057481 is an equidigital number, since it uses as much as digits as its factorization.

256057481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 256057481 is about 16001.7961804292. The cubic root of 256057481 is about 635.0079408766.

It can be divided in two parts, 25 and 6057481, that added together give a palindrome (6057506).

The spelling of 256057481 in words is "two hundred fifty-six million, fifty-seven thousand, four hundred eighty-one".