2199891 has 8 divisors (see below), whose sum is σ = 2951424. Its totient is φ = 1457480.

The previous prime is 2199889. The next prime is 2199893. The reversal of 2199891 is 1989912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2199889) and next prime (2199893).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2199891 - 2¹ = 2199889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2199893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1695 + ... + 2696.

It is an arithmetic number, because the mean of its divisors is an integer number (368928).

2^2199891 is an apocalyptic number.

2199891 is a deficient number, since it is larger than the sum of its proper divisors (751533).

2199891 is a wasteful number, since it uses less digits than its factorization.

2199891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561.

The product of its digits is 11664, while the sum is 39.

The square root of 2199891 is about 1483.2029530715. The cubic root of 2199891 is about 130.0569967032.

The spelling of 2199891 in words is "two million, one hundred ninety-nine thousand, eight hundred ninety-one".