68106809 has 2 divisors, whose sum is σ = 68106810. Its totient is φ = 68106808.

The previous prime is 68106763. The next prime is 68106817. The reversal of 68106809 is 90860186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48720400 + 19386409 = 6980^2 + 4403^2 .

It is a cyclic number.

It is not a de Polignac number, because 68106809 - 2¹⁶ = 68041273 is a prime.

It is not a weakly prime, because it can be changed into another prime (68106859) 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, 34053404 + 34053405.

It is an arithmetic number, because the mean of its divisors is an integer number (34053405).

Almost surely, 2^68106809 is an apocalyptic number.

It is an amenable number.

68106809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68106809 is an equidigital number, since it uses as much as digits as its factorization.

68106809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 68106809 is about 8252.6849570307. The cubic root of 68106809 is about 408.3791030559.

The spelling of 68106809 in words is "sixty-eight million, one hundred six thousand, eight hundred nine".