209334689 has 2 divisors, whose sum is σ = 209334690. Its totient is φ = 209334688.

The previous prime is 209334679. The next prime is 209334691. The reversal of 209334689 is 986433902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182034064 + 27300625 = 13492^2 + 5225^2 .

It is a cyclic number.

It is not a de Polignac number, because 209334689 - 2¹⁶ = 209269153 is a prime.

Together with 209334691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209334659) 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, 104667344 + 104667345.

It is an arithmetic number, because the mean of its divisors is an integer number (104667345).

Almost surely, 2^209334689 is an apocalyptic number.

It is an amenable number.

209334689 is a deficient number, since it is larger than the sum of its proper divisors (1).

209334689 is an equidigital number, since it uses as much as digits as its factorization.

209334689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 209334689 is about 14468.4031254316. The cubic root of 209334689 is about 593.7638238111.

The spelling of 209334689 in words is "two hundred nine million, three hundred thirty-four thousand, six hundred eighty-nine".