2173209009 has 8 divisors (see below), whose sum is σ = 2946724320. Its totient is φ = 1424249856.

The previous prime is 2173209007. The next prime is 2173209029. The reversal of 2173209009 is 9009023712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2173209009 - 2¹ = 2173209007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2173209007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6138832 + ... + 6139185.

It is an arithmetic number, because the mean of its divisors is an integer number (368340540).

Almost surely, 2^2173209009 is an apocalyptic number.

It is an amenable number.

2173209009 is a deficient number, since it is larger than the sum of its proper divisors (773515311).

2173209009 is a wasteful number, since it uses less digits than its factorization.

2173209009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12278079.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 2173209009 is about 46617.6898719789. The cubic root of 2173209009 is about 1295.2904560593.

The spelling of 2173209009 in words is "two billion, one hundred seventy-three million, two hundred nine thousand, nine".