2161588085 has 4 divisors (see below), whose sum is σ = 2593905708. Its totient is φ = 1729270464.

The previous prime is 2161588081. The next prime is 2161588127. The reversal of 2161588085 is 5808851612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1276347076 + 885241009 = 35726^2 + 29753^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161588085 - 2² = 2161588081 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 (2161588081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216158804 + ... + 216158813.

It is an arithmetic number, because the mean of its divisors is an integer number (648476427).

Almost surely, 2^2161588085 is an apocalyptic number.

It is an amenable number.

2161588085 is a deficient number, since it is larger than the sum of its proper divisors (432317623).

2161588085 is an equidigital number, since it uses as much as digits as its factorization.

2161588085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432317622.

The product of its (nonzero) digits is 153600, while the sum is 44.

The square root of 2161588085 is about 46492.8820896274. The cubic root of 2161588085 is about 1292.9775350610.

The spelling of 2161588085 in words is "two billion, one hundred sixty-one million, five hundred eighty-eight thousand, eighty-five".