2218091 has 2 divisors, whose sum is σ = 2218092. Its totient is φ = 2218090.

The previous prime is 2218067. The next prime is 2218093. The reversal of 2218091 is 1908122.

2218091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2218091 - 2¹⁰ = 2217067 is a prime.

It is a Sophie Germain prime.

Together with 2218093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2218093) 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 as a sum of consecutive naturals, namely, 1109045 + 1109046.

It is an arithmetic number, because the mean of its divisors is an integer number (1109046).

2^2218091 is an apocalyptic number.

2218091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218091 is an equidigital number, since it uses as much as digits as its factorization.

2218091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2218091 is about 1489.3256863426. The cubic root of 2218091 is about 130.4146719349.

The spelling of 2218091 in words is "two million, two hundred eighteen thousand, ninety-one".