2185216639 has 4 divisors (see below), whose sum is σ = 2185320256. Its totient is φ = 2185113024.

The previous prime is 2185216577. The next prime is 2185216651. The reversal of 2185216639 is 9366125812.

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 is a cyclic number.

It is not a de Polignac number, because 2185216639 - 2⁷ = 2185216511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2185216595 and 2185216604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185216339) 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, 7599 + ... + 66544.

It is an arithmetic number, because the mean of its divisors is an integer number (546330064).

Almost surely, 2^2185216639 is an apocalyptic number.

2185216639 is a deficient number, since it is larger than the sum of its proper divisors (103617).

2185216639 is an equidigital number, since it uses as much as digits as its factorization.

2185216639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103616.

The product of its digits is 155520, while the sum is 43.

The square root of 2185216639 is about 46746.3008055183. The cubic root of 2185216639 is about 1297.6716981781.

The spelling of 2185216639 in words is "two billion, one hundred eighty-five million, two hundred sixteen thousand, six hundred thirty-nine".