2191200909 has 4 divisors (see below), whose sum is σ = 2921601216. Its totient is φ = 1460800604.

The previous prime is 2191200887. The next prime is 2191200911. The reversal of 2191200909 is 9090021912.

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 a cyclic number.

It is not a de Polignac number, because 2191200909 - 2⁵ = 2191200877 is a prime.

It is a super-2 number, since 2×2191200909² = 9602722847204852562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2191200909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191200919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365200149 + ... + 365200154.

It is an arithmetic number, because the mean of its divisors is an integer number (730400304).

Almost surely, 2^2191200909 is an apocalyptic number.

It is an amenable number.

2191200909 is a deficient number, since it is larger than the sum of its proper divisors (730400307).

2191200909 is an equidigital number, since it uses as much as digits as its factorization.

2191200909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730400306.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 2191200909 is about 46810.2649960455. The cubic root of 2191200909 is about 1298.8551872140.

The spelling of 2191200909 in words is "two billion, one hundred ninety-one million, two hundred thousand, nine hundred nine".