2223181 has 4 divisors (see below), whose sum is σ = 2227612. Its totient is φ = 2218752.

The previous prime is 2223163. The next prime is 2223187. The reversal of 2223181 is 1813222.

2223181 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 can be written as a sum of positive squares in 2 ways, for example, as 2205225 + 17956 = 1485^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 2223181 - 2⁵ = 2223149 is a prime.

It is a super-2 number, since 2×2223181² = 9885067517522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2223187) 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, 1350 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (556903).

2^2223181 is an apocalyptic number.

It is an amenable number.

2223181 is a deficient number, since it is larger than the sum of its proper divisors (4431).

2223181 is an equidigital number, since it uses as much as digits as its factorization.

2223181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4430.

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

The square root of 2223181 is about 1491.0335341635. The cubic root of 2223181 is about 130.5143527810.

It can be divided in two parts, 222 and 3181, that added together give a triangular number (3403 = T₈₂).

The spelling of 2223181 in words is "two million, two hundred twenty-three thousand, one hundred eighty-one".