2081191 has 8 divisors (see below), whose sum is σ = 2518560. Its totient is φ = 1678848.

The previous prime is 2081171. The next prime is 2081237. The reversal of 2081191 is 1911802.

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 2081191 - 2⁵ = 2081159 is a prime.

It is a Duffinian number.

2081191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081161) 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 7 ways as a sum of consecutive naturals, for example, 8626 + ... + 8863.

It is an arithmetic number, because the mean of its divisors is an integer number (314820).

2^2081191 is an apocalyptic number.

2081191 is a deficient number, since it is larger than the sum of its proper divisors (437369).

2081191 is a wasteful number, since it uses less digits than its factorization.

2081191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17513.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 2081191 is about 1442.6333560541. The cubic root of 2081191 is about 127.6744453112.

Adding to 2081191 its reverse (1911802), we get a palindrome (3992993).

It can be divided in two parts, 20811 and 91, that added together give a palindrome (20902).

The spelling of 2081191 in words is "two million, eighty-one thousand, one hundred ninety-one".