2161443 has 4 divisors (see below), whose sum is σ = 2881928. Its totient is φ = 1440960.

The previous prime is 2161433. The next prime is 2161447. The reversal of 2161443 is 3441612.

2161443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2161443 - 2⁴ = 2161427 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360238 + ... + 360243.

It is an arithmetic number, because the mean of its divisors is an integer number (720482).

2^2161443 is an apocalyptic number.

2161443 is a deficient number, since it is larger than the sum of its proper divisors (720485).

2161443 is an equidigital number, since it uses as much as digits as its factorization.

2161443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720484.

The product of its digits is 576, while the sum is 21.

The square root of 2161443 is about 1470.1846822763. The cubic root of 2161443 is about 129.2948606354.

The spelling of 2161443 in words is "two million, one hundred sixty-one thousand, four hundred forty-three".