2219891 has 4 divisors (see below), whose sum is σ = 2316432. Its totient is φ = 2123352.

The previous prime is 2219887. The next prime is 2219923. The reversal of 2219891 is 1989122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1989122 = 2 ⋅994561.

It is a cyclic number.

It is not a de Polignac number, because 2219891 - 2² = 2219887 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2219801) 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, 48236 + ... + 48281.

It is an arithmetic number, because the mean of its divisors is an integer number (579108).

2^2219891 is an apocalyptic number.

2219891 is a deficient number, since it is larger than the sum of its proper divisors (96541).

2219891 is an equidigital number, since it uses as much as digits as its factorization.

2219891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96540.

The product of its digits is 2592, while the sum is 32.

The square root of 2219891 is about 1489.9298641211. The cubic root of 2219891 is about 130.4499399406.

The spelling of 2219891 in words is "two million, two hundred nineteen thousand, eight hundred ninety-one".