68930209 has 2 divisors, whose sum is σ = 68930210. Its totient is φ = 68930208.

The previous prime is 68930207. The next prime is 68930219. The reversal of 68930209 is 90203986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68840209 + 90000 = 8297^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 68930209 - 2¹ = 68930207 is a prime.

Together with 68930207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68930201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34465104 + 34465105.

It is an arithmetic number, because the mean of its divisors is an integer number (34465105).

Almost surely, 2^68930209 is an apocalyptic number.

It is an amenable number.

68930209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68930209 is an equidigital number, since it uses as much as digits as its factorization.

68930209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 68930209 is about 8302.4218755734. The cubic root of 68930209 is about 410.0182601425.

The spelling of 68930209 in words is "sixty-eight million, nine hundred thirty thousand, two hundred nine".