206930909 has 2 divisors, whose sum is σ = 206930910. Its totient is φ = 206930908.

The previous prime is 206930887. The next prime is 206930947. The reversal of 206930909 is 909039602.

It is an a-pointer prime, because the next prime (206930947) can be obtained adding 206930909 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189475225 + 17455684 = 13765^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 206930909 - 2²⁰ = 205882333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206930209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103465454 + 103465455.

It is an arithmetic number, because the mean of its divisors is an integer number (103465455).

Almost surely, 2^206930909 is an apocalyptic number.

It is an amenable number.

206930909 is a deficient number, since it is larger than the sum of its proper divisors (1).

206930909 is an equidigital number, since it uses as much as digits as its factorization.

206930909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 206930909 is about 14385.0932913207. The cubic root of 206930909 is about 591.4823483877.

The spelling of 206930909 in words is "two hundred six million, nine hundred thirty thousand, nine hundred nine".