2182718209 has 4 divisors (see below), whose sum is σ = 2494535104. Its totient is φ = 1870901316.

The previous prime is 2182718207. The next prime is 2182718221. The reversal of 2182718209 is 9028172812.

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.

It is a cyclic number.

It is not a de Polignac number, because 2182718209 - 2¹ = 2182718207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2182718203) 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, 155908437 + ... + 155908450.

It is an arithmetic number, because the mean of its divisors is an integer number (623633776).

Almost surely, 2^2182718209 is an apocalyptic number.

It is an amenable number.

2182718209 is a deficient number, since it is larger than the sum of its proper divisors (311816895).

2182718209 is an equidigital number, since it uses as much as digits as its factorization.

2182718209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311816894.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 2182718209 is about 46719.5698717358. The cubic root of 2182718209 is about 1297.1769526772.

The spelling of 2182718209 in words is "two billion, one hundred eighty-two million, seven hundred eighteen thousand, two hundred nine".