2208849209 has 4 divisors (see below), whose sum is σ = 2524399104. Its totient is φ = 1893299316.

The previous prime is 2208849163. The next prime is 2208849221. The reversal of 2208849209 is 9029488022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9029488022 = 2 ⋅4514744011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2208849209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2208849209.

It is not an unprimeable number, because it can be changed into a prime (2208849299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157774937 + ... + 157774950.

It is an arithmetic number, because the mean of its divisors is an integer number (631099776).

Almost surely, 2^2208849209 is an apocalyptic number.

It is an amenable number.

2208849209 is a deficient number, since it is larger than the sum of its proper divisors (315549895).

2208849209 is an equidigital number, since it uses as much as digits as its factorization.

2208849209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315549894.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 2208849209 is about 46998.3958130488. The cubic root of 2208849209 is about 1302.3329329892.

The spelling of 2208849209 in words is "two billion, two hundred eight million, eight hundred forty-nine thousand, two hundred nine".