209433454309 has 2 divisors, whose sum is σ = 209433454310. Its totient is φ = 209433454308.

The previous prime is 209433454283. The next prime is 209433454367. The reversal of 209433454309 is 903454334902.

209433454309 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., 131712378084 + 77721076225 = 362922^2 + 278785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209433454309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209433452309) 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, 104716727154 + 104716727155.

It is an arithmetic number, because the mean of its divisors is an integer number (104716727155).

Almost surely, 2^209433454309 is an apocalyptic number.

It is an amenable number.

209433454309 is a deficient number, since it is larger than the sum of its proper divisors (1).

209433454309 is an equidigital number, since it uses as much as digits as its factorization.

209433454309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 209433454309 in words is "two hundred nine billion, four hundred thirty-three million, four hundred fifty-four thousand, three hundred nine".