2012181 has 4 divisors (see below), whose sum is σ = 2682912. Its totient is φ = 1341452.

The previous prime is 2012173. The next prime is 2012189. The reversal of 2012181 is 1812102.

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 (2012173) and next prime (2012189).

It is a cyclic number.

It is not a de Polignac number, because 2012181 - 2³ = 2012173 is a prime.

It is a super-2 number, since 2×2012181² = 8097744753522, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2012181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335361 + ... + 335366.

It is an arithmetic number, because the mean of its divisors is an integer number (670728).

2^2012181 is an apocalyptic number.

It is an amenable number.

2012181 is a deficient number, since it is larger than the sum of its proper divisors (670731).

2012181 is an equidigital number, since it uses as much as digits as its factorization.

2012181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670730.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 2012181 is about 1418.5136587287. The cubic root of 2012181 is about 126.2473724251.

Adding to 2012181 its reverse (1812102), we get a palindrome (3824283).

It can be divided in two parts, 20121 and 81, that added together give a palindrome (20202).

The spelling of 2012181 in words is "two million, twelve thousand, one hundred eighty-one".