65982209 has 2 divisors, whose sum is σ = 65982210. Its totient is φ = 65982208.

The previous prime is 65982199. The next prime is 65982227. The reversal of 65982209 is 90228956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59367025 + 6615184 = 7705^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 65982209 - 2⁸ = 65981953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65982409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32991104 + 32991105.

It is an arithmetic number, because the mean of its divisors is an integer number (32991105).

Almost surely, 2^65982209 is an apocalyptic number.

It is an amenable number.

65982209 is a deficient number, since it is larger than the sum of its proper divisors (1).

65982209 is an equidigital number, since it uses as much as digits as its factorization.

65982209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 65982209 is about 8122.9433704785. The cubic root of 65982209 is about 404.0876868287.

The spelling of 65982209 in words is "sixty-five million, nine hundred eighty-two thousand, two hundred nine".