168338281 has 2 divisors, whose sum is σ = 168338282. Its totient is φ = 168338280.

The previous prime is 168338227. The next prime is 168338321. The reversal of 168338281 is 182833861.

It is an a-pointer prime, because the next prime (168338321) can be obtained adding 168338281 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151659225 + 16679056 = 12315^2 + 4084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168338281 is a prime.

It is a super-2 number, since 2×168338281² = 56675553700069922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168338221) 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, 84169140 + 84169141.

It is an arithmetic number, because the mean of its divisors is an integer number (84169141).

Almost surely, 2^168338281 is an apocalyptic number.

It is an amenable number.

168338281 is a deficient number, since it is larger than the sum of its proper divisors (1).

168338281 is an equidigital number, since it uses as much as digits as its factorization.

168338281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 168338281 is about 12974.5243072723. The cubic root of 168338281 is about 552.1549407964.

The spelling of 168338281 in words is "one hundred sixty-eight million, three hundred thirty-eight thousand, two hundred eighty-one".