289209609 has 28 divisors (see below), whose sum is σ = 466986436. Its totient is φ = 177969312.

The previous prime is 289209589. The next prime is 289209611. The reversal of 289209609 is 906902982.

It can be written as a sum of positive squares in 2 ways, for example, as 13483584 + 275726025 = 3672^2 + 16605^2 .

It is not a de Polignac number, because 289209609 - 2¹¹ = 289207561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289209629) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5782 + ... + 24735.

It is an arithmetic number, because the mean of its divisors is an integer number (16678087).

Almost surely, 2^289209609 is an apocalyptic number.

It is an amenable number.

289209609 is a deficient number, since it is larger than the sum of its proper divisors (177776827).

289209609 is an equidigital number, since it uses as much as digits as its factorization.

289209609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30548 (or 30533 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 289209609 is about 17006.1638531445. The cubic root of 289209609 is about 661.3087049247.

The spelling of 289209609 in words is "two hundred eighty-nine million, two hundred nine thousand, six hundred nine".