2208181 has 4 divisors (see below), whose sum is σ = 2338092. Its totient is φ = 2078272.

The previous prime is 2208131. The next prime is 2208203. The reversal of 2208181 is 1818022.

2208181 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 864900 + 1343281 = 930^2 + 1159^2 .

It is a cyclic number.

It is not a de Polignac number, because 2208181 - 2⁷ = 2208053 is a prime.

It is a super-2 number, since 2×2208181² = 9752126657522, 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 (2208131) 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, 64930 + ... + 64963.

It is an arithmetic number, because the mean of its divisors is an integer number (584523).

2^2208181 is an apocalyptic number.

It is an amenable number.

2208181 is a deficient number, since it is larger than the sum of its proper divisors (129911).

2208181 is a wasteful number, since it uses less digits than its factorization.

2208181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129910.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 2208181 is about 1485.9949528851. The cubic root of 2208181 is about 130.2201594862.

The spelling of 2208181 in words is "two million, two hundred eight thousand, one hundred eighty-one".