2208718009 has 3 divisors (see below), whose sum is σ = 2208765007. Its totient is φ = 2208671012.

The previous prime is 2208717989. The next prime is 2208718049. The reversal of 2208718009 is 9008178022.

The square root of 2208718009 is 46997.

It is a perfect power (a square), and thus also a powerful number.

2208718009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1037162025 + 1171555984 = 32205^2 + 34228^2 .

It is not a de Polignac number, because 2208718009 - 2¹⁹ = 2208193721 is a prime.

It is a super-3 number, since 3×2208718009³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2208718049) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 23499 + ... + 70495.

Almost surely, 2^2208718009 is an apocalyptic number.

2208718009 is the 46997-th square number.

2208718009 is the 23499-th centered octagonal number.

It is an amenable number.

2208718009 is a deficient number, since it is larger than the sum of its proper divisors (46998).

2208718009 is an frugal number, since it uses more digits than its factorization.

2208718009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93994 (or 46997 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The cubic root of 2208718009 is about 1302.3071473956.

The spelling of 2208718009 in words is "two billion, two hundred eight million, seven hundred eighteen thousand, nine".