206216729 has 2 divisors, whose sum is σ = 206216730. Its totient is φ = 206216728.

The previous prime is 206216719. The next prime is 206216753. The reversal of 206216729 is 927612602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198105625 + 8111104 = 14075^2 + 2848^2 .

It is a cyclic number.

It is not a de Polignac number, because 206216729 - 2⁸ = 206216473 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 (206216719) 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, 103108364 + 103108365.

It is an arithmetic number, because the mean of its divisors is an integer number (103108365).

Almost surely, 2^206216729 is an apocalyptic number.

It is an amenable number.

206216729 is a deficient number, since it is larger than the sum of its proper divisors (1).

206216729 is an equidigital number, since it uses as much as digits as its factorization.

206216729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 206216729 is about 14360.2482220886. The cubic root of 206216729 is about 590.8011036657.

The spelling of 206216729 in words is "two hundred six million, two hundred sixteen thousand, seven hundred twenty-nine".