68486309 has 2 divisors, whose sum is σ = 68486310. Its totient is φ = 68486308.

The previous prime is 68486303. The next prime is 68486321. The reversal of 68486309 is 90368486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56776225 + 11710084 = 7535^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 68486309 - 2⁴ = 68486293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68486309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68486303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34243154 + 34243155.

It is an arithmetic number, because the mean of its divisors is an integer number (34243155).

Almost surely, 2^68486309 is an apocalyptic number.

It is an amenable number.

68486309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68486309 is an equidigital number, since it uses as much as digits as its factorization.

68486309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 68486309 is about 8275.6455337333. The cubic root of 68486309 is about 409.1362123850.

The spelling of 68486309 in words is "sixty-eight million, four hundred eighty-six thousand, three hundred nine".