256326281 has 2 divisors, whose sum is σ = 256326282. Its totient is φ = 256326280.

The previous prime is 256326277. The next prime is 256326293. The reversal of 256326281 is 182623652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161925625 + 94400656 = 12725^2 + 9716^2 .

It is a cyclic number.

It is not a de Polignac number, because 256326281 - 2² = 256326277 is a prime.

It is a super-2 number, since 2×256326281² = 131406324662581922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256326211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128163140 + 128163141.

It is an arithmetic number, because the mean of its divisors is an integer number (128163141).

Almost surely, 2^256326281 is an apocalyptic number.

It is an amenable number.

256326281 is a deficient number, since it is larger than the sum of its proper divisors (1).

256326281 is an equidigital number, since it uses as much as digits as its factorization.

256326281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 256326281 is about 16010.1930344390. The cubic root of 256326281 is about 635.2300660553.

It can be divided in two parts, 25632 and 6281, that added together give a palindrome (31913).

The spelling of 256326281 in words is "two hundred fifty-six million, three hundred twenty-six thousand, two hundred eighty-one".