68386517 has 2 divisors, whose sum is σ = 68386518. Its totient is φ = 68386516.

The previous prime is 68386481. The next prime is 68386519. The reversal of 68386517 is 71568386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34210801 + 34175716 = 5849^2 + 5846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68386517 is a prime.

Together with 68386519, 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 (68386519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34193258 + 34193259.

It is an arithmetic number, because the mean of its divisors is an integer number (34193259).

Almost surely, 2^68386517 is an apocalyptic number.

It is an amenable number.

68386517 is a deficient number, since it is larger than the sum of its proper divisors (1).

68386517 is an equidigital number, since it uses as much as digits as its factorization.

68386517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 68386517 is about 8269.6140780571. The cubic root of 68386517 is about 408.9373971371.

The spelling of 68386517 in words is "sixty-eight million, three hundred eighty-six thousand, five hundred seventeen".