68159209 has 2 divisors, whose sum is σ = 68159210. Its totient is φ = 68159208.

The previous prime is 68159207. The next prime is 68159233. The reversal of 68159209 is 90295186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 6615184 = 7845^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 68159209 - 2¹ = 68159207 is a prime.

Together with 68159207, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68159207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34079604 + 34079605.

It is an arithmetic number, because the mean of its divisors is an integer number (34079605).

Almost surely, 2^68159209 is an apocalyptic number.

It is an amenable number.

68159209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68159209 is an equidigital number, since it uses as much as digits as its factorization.

68159209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 68159209 is about 8255.8590709871. The cubic root of 68159209 is about 408.4838090790.

The spelling of 68159209 in words is "sixty-eight million, one hundred fifty-nine thousand, two hundred nine".