2196181 has 4 divisors (see below), whose sum is σ = 2365132. Its totient is φ = 2027232.

The previous prime is 2196167. The next prime is 2196197. The reversal of 2196181 is 1816912.

It is a happy number.

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 1500625 + 695556 = 1225^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 2196181 - 2⁵ = 2196149 is a prime.

It is a super-2 number, since 2×2196181² = 9646421969522, which contains 22 as substring.

It is a Duffinian number.

2196181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2196781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84456 + ... + 84481.

It is an arithmetic number, because the mean of its divisors is an integer number (591283).

2^2196181 is an apocalyptic number.

It is an amenable number.

2196181 is a deficient number, since it is larger than the sum of its proper divisors (168951).

2196181 is a wasteful number, since it uses less digits than its factorization.

2196181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168950.

The product of its digits is 864, while the sum is 28.

The square root of 2196181 is about 1481.9517536006. The cubic root of 2196181 is about 129.9838441461.

It can be divided in two parts, 219 and 6181, that added together give a square (6400 = 80²).

The spelling of 2196181 in words is "two million, one hundred ninety-six thousand, one hundred eighty-one".