206354512009 has 2 divisors, whose sum is σ = 206354512010. Its totient is φ = 206354512008.

The previous prime is 206354512003. The next prime is 206354512069. The reversal of 206354512009 is 900215453602.

206354512009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197894191609 + 8460320400 = 444853^2 + 91980^2 .

It is a cyclic number.

It is not a de Polignac number, because 206354512009 - 2¹¹ = 206354509961 is a prime.

It is not a weakly prime, because it can be changed into another prime (206354512003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103177256004 + 103177256005.

It is an arithmetic number, because the mean of its divisors is an integer number (103177256005).

Almost surely, 2^206354512009 is an apocalyptic number.

It is an amenable number.

206354512009 is a deficient number, since it is larger than the sum of its proper divisors (1).

206354512009 is an equidigital number, since it uses as much as digits as its factorization.

206354512009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 206354512009 in words is "two hundred six billion, three hundred fifty-four million, five hundred twelve thousand, nine".