268856281 has 2 divisors, whose sum is σ = 268856282. Its totient is φ = 268856280.

The previous prime is 268856279. The next prime is 268856293. The reversal of 268856281 is 182658862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265396681 + 3459600 = 16291^2 + 1860^2 .

It is a cyclic number.

It is not a de Polignac number, because 268856281 - 2¹ = 268856279 is a prime.

It is a super-2 number, since 2×268856281² = 144567399666301922, which contains 22 as substring.

Together with 268856279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (268856201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134428140 + 134428141.

It is an arithmetic number, because the mean of its divisors is an integer number (134428141).

Almost surely, 2^268856281 is an apocalyptic number.

It is an amenable number.

268856281 is a deficient number, since it is larger than the sum of its proper divisors (1).

268856281 is an equidigital number, since it uses as much as digits as its factorization.

268856281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 368640, while the sum is 46.

The square root of 268856281 is about 16396.8375304508. The cubic root of 268856281 is about 645.4164976166.

The spelling of 268856281 in words is "two hundred sixty-eight million, eight hundred fifty-six thousand, two hundred eighty-one".