256336181 has 2 divisors, whose sum is σ = 256336182. Its totient is φ = 256336180.

The previous prime is 256336159. The next prime is 256336253. The reversal of 256336181 is 181633652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255712081 + 624100 = 15991^2 + 790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256336181 is a prime.

It is a super-2 number, since 2×256336181² = 131416475379329522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256336681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128168090 + 128168091.

It is an arithmetic number, because the mean of its divisors is an integer number (128168091).

Almost surely, 2^256336181 is an apocalyptic number.

It is an amenable number.

256336181 is a deficient number, since it is larger than the sum of its proper divisors (1).

256336181 is an equidigital number, since it uses as much as digits as its factorization.

256336181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 256336181 is about 16010.5022094874. The cubic root of 256336181 is about 635.2382440393.

The spelling of 256336181 in words is "two hundred fifty-six million, three hundred thirty-six thousand, one hundred eighty-one".