2162161 has 4 divisors (see below), whose sum is σ = 2256192. Its totient is φ = 2068132.

The previous prime is 2162137. The next prime is 2162177. The reversal of 2162161 is 1612612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2162161 - 2¹¹ = 2160113 is a prime.

It is a pancake number, because a pancake can be divided into 2162161 parts by 2079 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2162191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46981 + ... + 47026.

It is an arithmetic number, because the mean of its divisors is an integer number (564048).

2^2162161 is an apocalyptic number.

It is an amenable number.

2162161 is a deficient number, since it is larger than the sum of its proper divisors (94031).

2162161 is an equidigital number, since it uses as much as digits as its factorization.

2162161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94030.

The product of its digits is 144, while the sum is 19.

The square root of 2162161 is about 1470.4288490097. The cubic root of 2162161 is about 129.3091756760.

Adding to 2162161 its reverse (1612612), we get a palindrome (3774773).

The spelling of 2162161 in words is "two million, one hundred sixty-two thousand, one hundred sixty-one".