2000191 has 4 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 1991584.

The previous prime is 2000177. The next prime is 2000209. The reversal of 2000191 is 1910002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2000191 - 2¹³ = 1991999 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 (2000291) 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, 3946 + ... + 4423.

It is an arithmetic number, because the mean of its divisors is an integer number (502200).

2^2000191 is an apocalyptic number.

2000191 is a deficient number, since it is larger than the sum of its proper divisors (8609).

2000191 is an equidigital number, since it uses as much as digits as its factorization.

2000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8608.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 2000191 is about 1414.2810894585. The cubic root of 2000191 is about 125.9961156105.

Adding to 2000191 its reverse (1910002), we get a palindrome (3910193).

The spelling of 2000191 in words is "two million, one hundred ninety-one", and thus it is an aban number.