2218891 has 4 divisors (see below), whose sum is σ = 2349432. Its totient is φ = 2088352.

The previous prime is 2218883. The next prime is 2218897. The reversal of 2218891 is 1988122.

It is a happy number.

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 2218891 - 2³ = 2218883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2218897) 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, 65245 + ... + 65278.

It is an arithmetic number, because the mean of its divisors is an integer number (587358).

2^2218891 is an apocalyptic number.

2218891 is a deficient number, since it is larger than the sum of its proper divisors (130541).

2218891 is a wasteful number, since it uses less digits than its factorization.

2218891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130540.

The product of its digits is 2304, while the sum is 31.

The square root of 2218891 is about 1489.5942400533. The cubic root of 2218891 is about 130.4303489588.

The spelling of 2218891 in words is "two million, two hundred eighteen thousand, eight hundred ninety-one".