2185705109 has 16 divisors (see below), whose sum is σ = 2666465280. Its totient is φ = 1749852720.

The previous prime is 2185705103. The next prime is 2185705117. The reversal of 2185705109 is 9015075812.

It is a de Polignac number, because none of the positive numbers 2^k-2185705109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185705103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106289 + ... + 125174.

It is an arithmetic number, because the mean of its divisors is an integer number (166654080).

Almost surely, 2^2185705109 is an apocalyptic number.

It is an amenable number.

2185705109 is a deficient number, since it is larger than the sum of its proper divisors (480760171).

2185705109 is a wasteful number, since it uses less digits than its factorization.

2185705109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231560.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 2185705109 is about 46751.5252050668. The cubic root of 2185705109 is about 1297.7683821801.

The spelling of 2185705109 in words is "two billion, one hundred eighty-five million, seven hundred five thousand, one hundred nine".