209729089 has 2 divisors, whose sum is σ = 209729090. Its totient is φ = 209729088.

The previous prime is 209729077. The next prime is 209729161. The reversal of 209729089 is 980927902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185640625 + 24088464 = 13625^2 + 4908^2 .

It is a cyclic number.

It is not a de Polignac number, because 209729089 - 2⁹ = 209728577 is a prime.

It is not a weakly prime, because it can be changed into another prime (209729029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104864544 + 104864545.

It is an arithmetic number, because the mean of its divisors is an integer number (104864545).

Almost surely, 2^209729089 is an apocalyptic number.

It is an amenable number.

209729089 is a deficient number, since it is larger than the sum of its proper divisors (1).

209729089 is an equidigital number, since it uses as much as digits as its factorization.

209729089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 209729089 is about 14482.0264120737. The cubic root of 209729089 is about 594.1364862632.

The spelling of 209729089 in words is "two hundred nine million, seven hundred twenty-nine thousand, eighty-nine".