2218191 has 4 divisors (see below), whose sum is σ = 2957592. Its totient is φ = 1478792.

The previous prime is 2218171. The next prime is 2218199. The reversal of 2218191 is 1918122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2218191 - 2⁶ = 2218127 is a prime.

It is a D-number.

2218191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218199) 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, 369696 + ... + 369701.

It is an arithmetic number, because the mean of its divisors is an integer number (739398).

2^2218191 is an apocalyptic number.

2218191 is a deficient number, since it is larger than the sum of its proper divisors (739401).

2218191 is an equidigital number, since it uses as much as digits as its factorization.

2218191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739400.

The product of its digits is 288, while the sum is 24.

The square root of 2218191 is about 1489.3592582047. The cubic root of 2218191 is about 130.4166317690.

The spelling of 2218191 in words is "two million, two hundred eighteen thousand, one hundred ninety-one".