2011181 has 4 divisors (see below), whose sum is σ = 2023392. Its totient is φ = 1998972.

The previous prime is 2011171. The next prime is 2011183. The reversal of 2011181 is 1811102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1811102 = 2 ⋅905551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011181 is a prime.

It is a super-2 number, since 2×2011181² = 8089698029522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011183) 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, 5855 + ... + 6188.

It is an arithmetic number, because the mean of its divisors is an integer number (505848).

2^2011181 is an apocalyptic number.

It is an amenable number.

2011181 is a deficient number, since it is larger than the sum of its proper divisors (12211).

2011181 is a wasteful number, since it uses less digits than its factorization.

2011181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12210.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 2011181 is about 1418.1611332990. The cubic root of 2011181 is about 126.2264551067.

Adding to 2011181 its reverse (1811102), we get a palindrome (3822283).

The spelling of 2011181 in words is "two million, eleven thousand, one hundred eighty-one".