2162981165 has 4 divisors (see below), whose sum is σ = 2595577404. Its totient is φ = 1730384928.

The previous prime is 2162981143. The next prime is 2162981209. The reversal of 2162981165 is 5611892612.

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 703893961 + 1459087204 = 26531^2 + 38198^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162981165 - 2⁸ = 2162980909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216298112 + ... + 216298121.

It is an arithmetic number, because the mean of its divisors is an integer number (648894351).

Almost surely, 2^2162981165 is an apocalyptic number.

It is an amenable number.

2162981165 is a deficient number, since it is larger than the sum of its proper divisors (432596239).

2162981165 is an equidigital number, since it uses as much as digits as its factorization.

2162981165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432596238.

The product of its digits is 51840, while the sum is 41.

The square root of 2162981165 is about 46507.8613247266. The cubic root of 2162981165 is about 1293.2552374211.

The spelling of 2162981165 in words is "two billion, one hundred sixty-two million, nine hundred eighty-one thousand, one hundred sixty-five".