2185091065 has 32 divisors (see below), whose sum is σ = 2725138080. Its totient is φ = 1681152000.

The previous prime is 2185091059. The next prime is 2185091093. The reversal of 2185091065 is 5601905812.

It can be written as a sum of positive squares in 16 ways, for example, as 792084736 + 1393006329 = 28144^2 + 37323^2 .

It is not a de Polignac number, because 2185091065 - 2⁹ = 2185090553 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2741247 + ... + 2742043.

It is an arithmetic number, because the mean of its divisors is an integer number (85160565).

Almost surely, 2^2185091065 is an apocalyptic number.

It is an amenable number.

2185091065 is a deficient number, since it is larger than the sum of its proper divisors (540047015).

2185091065 is a wasteful number, since it uses less digits than its factorization.

2185091065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 2185091065 is about 46744.9576425094. The cubic root of 2185091065 is about 1297.6468406965.

Adding to 2185091065 its reverse (5601905812), we get a palindrome (7786996877).

The spelling of 2185091065 in words is "two billion, one hundred eighty-five million, ninety-one thousand, sixty-five".