2081181 has 4 divisors (see below), whose sum is σ = 2774912. Its totient is φ = 1387452.

The previous prime is 2081171. The next prime is 2081237. The reversal of 2081181 is 1811802.

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 not a de Polignac number, because 2081181 - 2¹⁰ = 2080157 is a prime.

It is a super-2 number, since 2×2081181² = 8662628709522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 346861 + ... + 346866.

It is an arithmetic number, because the mean of its divisors is an integer number (693728).

2^2081181 is an apocalyptic number.

It is an amenable number.

2081181 is a deficient number, since it is larger than the sum of its proper divisors (693731).

2081181 is an equidigital number, since it uses as much as digits as its factorization.

2081181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693730.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 2081181 is about 1442.6298901659. The cubic root of 2081181 is about 127.6742408215.

Adding to 2081181 its reverse (1811802), we get a palindrome (3892983).

The spelling of 2081181 in words is "two million, eighty-one thousand, one hundred eighty-one".