68018281 has 2 divisors, whose sum is σ = 68018282. Its totient is φ = 68018280.

The previous prime is 68018273. The next prime is 68018287. The reversal of 68018281 is 18281086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66275881 + 1742400 = 8141^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 68018281 - 2³ = 68018273 is a prime.

It is a super-2 number, since 2×68018281² = 9252973100389922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68018287) 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, 34009140 + 34009141.

It is an arithmetic number, because the mean of its divisors is an integer number (34009141).

Almost surely, 2^68018281 is an apocalyptic number.

It is an amenable number.

68018281 is a deficient number, since it is larger than the sum of its proper divisors (1).

68018281 is an equidigital number, since it uses as much as digits as its factorization.

68018281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 68018281 is about 8247.3196251873. The cubic root of 68018281 is about 408.2020837463.

The spelling of 68018281 in words is "sixty-eight million, eighteen thousand, two hundred eighty-one".