68820317 has 2 divisors, whose sum is σ = 68820318. Its totient is φ = 68820316.

The previous prime is 68820293. The next prime is 68820319. The reversal of 68820317 is 71302886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 24810361 = 6634^2 + 4981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68820317 is a prime.

Together with 68820319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68820319) 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, 34410158 + 34410159.

It is an arithmetic number, because the mean of its divisors is an integer number (34410159).

Almost surely, 2^68820317 is an apocalyptic number.

It is an amenable number.

68820317 is a deficient number, since it is larger than the sum of its proper divisors (1).

68820317 is an equidigital number, since it uses as much as digits as its factorization.

68820317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 68820317 is about 8295.8011668554. The cubic root of 68820317 is about 409.8002536837.

The spelling of 68820317 in words is "sixty-eight million, eight hundred twenty thousand, three hundred seventeen".