256082681 has 2 divisors, whose sum is σ = 256082682. Its totient is φ = 256082680.

The previous prime is 256082663. The next prime is 256082689. The reversal of 256082681 is 186280652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175801081 + 80281600 = 13259^2 + 8960^2 .

It is a cyclic number.

It is not a de Polignac number, because 256082681 - 2¹⁴ = 256066297 is a prime.

It is a super-2 number, since 2×256082681² = 131156679016295522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256082689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128041340 + 128041341.

It is an arithmetic number, because the mean of its divisors is an integer number (128041341).

Almost surely, 2^256082681 is an apocalyptic number.

It is an amenable number.

256082681 is a deficient number, since it is larger than the sum of its proper divisors (1).

256082681 is an equidigital number, since it uses as much as digits as its factorization.

256082681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 256082681 is about 16002.5835726610. The cubic root of 256082681 is about 635.0287717139.

The spelling of 256082681 in words is "two hundred fifty-six million, eighty-two thousand, six hundred eighty-one".