68306309 has 2 divisors, whose sum is σ = 68306310. Its totient is φ = 68306308.

The previous prime is 68306279. The next prime is 68306321. The reversal of 68306309 is 90360386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50481025 + 17825284 = 7105^2 + 4222^2 .

It is a cyclic number.

It is not a de Polignac number, because 68306309 - 2⁸ = 68306053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68306809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34153154 + 34153155.

It is an arithmetic number, because the mean of its divisors is an integer number (34153155).

Almost surely, 2^68306309 is an apocalyptic number.

It is an amenable number.

68306309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68306309 is an equidigital number, since it uses as much as digits as its factorization.

68306309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 68306309 is about 8264.7630940034. The cubic root of 68306309 is about 408.7774587756. Note that the first 3 decimals are identical.

The spelling of 68306309 in words is "sixty-eight million, three hundred six thousand, three hundred nine".