68306321 has 2 divisors, whose sum is σ = 68306322. Its totient is φ = 68306320.

The previous prime is 68306309. The next prime is 68306327. The reversal of 68306321 is 12360386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 26884225 = 6436^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 68306321 - 2⁶ = 68306257 is a prime.

It is not a weakly prime, because it can be changed into another prime (68306327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34153160 + 34153161.

It is an arithmetic number, because the mean of its divisors is an integer number (34153161).

Almost surely, 2^68306321 is an apocalyptic number.

It is an amenable number.

68306321 is a deficient number, since it is larger than the sum of its proper divisors (1).

68306321 is an equidigital number, since it uses as much as digits as its factorization.

68306321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 68306321 is about 8264.7638199770. The cubic root of 68306321 is about 408.7774827135. Note that the first 3 decimals are identical.

The spelling of 68306321 in words is "sixty-eight million, three hundred six thousand, three hundred twenty-one".