2811223 has 4 divisors (see below), whose sum is σ = 2887240. Its totient is φ = 2735208.

The previous prime is 2811217. The next prime is 2811227. The reversal of 2811223 is 3221182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3221182 = 2 ⋅1610591.

It is a cyclic number.

It is not a de Polignac number, because 2811223 - 2⁵ = 2811191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2811223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2811227) 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, 37953 + ... + 38026.

It is an arithmetic number, because the mean of its divisors is an integer number (721810).

2^2811223 is an apocalyptic number.

2811223 is a deficient number, since it is larger than the sum of its proper divisors (76017).

2811223 is an equidigital number, since it uses as much as digits as its factorization.

2811223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76016.

The product of its digits is 192, while the sum is 19.

The square root of 2811223 is about 1676.6702120572. The cubic root of 2811223 is about 141.1340374889.

The spelling of 2811223 in words is "two million, eight hundred eleven thousand, two hundred twenty-three".