68919317 has 2 divisors, whose sum is σ = 68919318. Its totient is φ = 68919316.

The previous prime is 68919313. The next prime is 68919353. The reversal of 68919317 is 71391986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68790436 + 128881 = 8294^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 68919317 - 2² = 68919313 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68919313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34459658 + 34459659.

It is an arithmetic number, because the mean of its divisors is an integer number (34459659).

Almost surely, 2^68919317 is an apocalyptic number.

It is an amenable number.

68919317 is a deficient number, since it is larger than the sum of its proper divisors (1).

68919317 is an equidigital number, since it uses as much as digits as its factorization.

68919317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 68919317 is about 8301.7658964825. The cubic root of 68919317 is about 409.9966626736.

The spelling of 68919317 in words is "sixty-eight million, nine hundred nineteen thousand, three hundred seventeen".