2191109 has 4 divisors (see below), whose sum is σ = 2196000. Its totient is φ = 2186220.

The previous prime is 2191097. The next prime is 2191121. The reversal of 2191109 is 9011912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2191097) and next prime (2191121).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191109 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 (2191159) 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, 1697 + ... + 2694.

It is an arithmetic number, because the mean of its divisors is an integer number (549000).

2^2191109 is an apocalyptic number.

It is an amenable number.

2191109 is a deficient number, since it is larger than the sum of its proper divisors (4891).

2191109 is an equidigital number, since it uses as much as digits as its factorization.

2191109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4890.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 2191109 is about 1480.2395076473. The cubic root of 2191109 is about 129.8837026982.

The spelling of 2191109 in words is "two million, one hundred ninety-one thousand, one hundred nine".