168281329 has 2 divisors, whose sum is σ = 168281330. Its totient is φ = 168281328.

The previous prime is 168281293. The next prime is 168281369. The reversal of 168281329 is 923182861.

Together with previous prime (168281293) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (168281369) can be obtained adding 168281329 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160073104 + 8208225 = 12652^2 + 2865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168281329 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 168281291 and 168281300.

It is not a weakly prime, because it can be changed into another prime (168281369) 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, 84140664 + 84140665.

It is an arithmetic number, because the mean of its divisors is an integer number (84140665).

Almost surely, 2^168281329 is an apocalyptic number.

It is an amenable number.

168281329 is a deficient number, since it is larger than the sum of its proper divisors (1).

168281329 is an equidigital number, since it uses as much as digits as its factorization.

168281329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 168281329 is about 12972.3293590627. The cubic root of 168281329 is about 552.0926656463.

The spelling of 168281329 in words is "one hundred sixty-eight million, two hundred eighty-one thousand, three hundred twenty-nine".