2822161 has 4 divisors (see below), whose sum is σ = 2825524. Its totient is φ = 2818800.

The previous prime is 2822159. The next prime is 2822189. The reversal of 2822161 is 1612282.

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 can be written as a sum of positive squares in 2 ways, for example, as 774400 + 2047761 = 880^2 + 1431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2822161 - 2¹ = 2822159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2822191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751 + ... + 2491.

It is an arithmetic number, because the mean of its divisors is an integer number (706381).

2^2822161 is an apocalyptic number.

It is an amenable number.

2822161 is a deficient number, since it is larger than the sum of its proper divisors (3363).

2822161 is a wasteful number, since it uses less digits than its factorization.

2822161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3362.

The product of its digits is 384, while the sum is 22.

The square root of 2822161 is about 1679.9288675417. The cubic root of 2822161 is about 141.3168436074.

It can be divided in two parts, 28221 and 61, that added together give a palindrome (28282).

The spelling of 2822161 in words is "two million, eight hundred twenty-two thousand, one hundred sixty-one".