2199991 has 8 divisors (see below), whose sum is σ = 2343600. Its totient is φ = 2059200.

The previous prime is 2199979. The next prime is 2200013. The reversal of 2199991 is 1999912.

2199991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2199991 - 2⁵ = 2199959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199931) 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 in 7 ways as a sum of consecutive naturals, for example, 1041 + ... + 2341.

It is an arithmetic number, because the mean of its divisors is an integer number (292950).

2^2199991 is an apocalyptic number.

2199991 is a deficient number, since it is larger than the sum of its proper divisors (143609).

2199991 is a wasteful number, since it uses less digits than its factorization.

2199991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409.

The product of its digits is 13122, while the sum is 40.

The square root of 2199991 is about 1483.2366635166. The cubic root of 2199991 is about 130.0589673315.

The spelling of 2199991 in words is "two million, one hundred ninety-nine thousand, nine hundred ninety-one".