11116181 has 4 divisors (see below), whose sum is σ = 11770092. Its totient is φ = 10462272.

The previous prime is 11116177. The next prime is 11116187. The reversal of 11116181 is 18161111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 2531281 = 2930^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 11116181 - 2² = 11116177 is a prime.

It is a super-2 number, since 2×11116181² = 247138960049522, 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 (11116187) 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, 326930 + ... + 326963.

It is an arithmetic number, because the mean of its divisors is an integer number (2942523).

Almost surely, 2^11116181 is an apocalyptic number.

It is an amenable number.

11116181 is a deficient number, since it is larger than the sum of its proper divisors (653911).

11116181 is an equidigital number, since it uses as much as digits as its factorization.

11116181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653910.

The product of its digits is 48, while the sum is 20.

The square root of 11116181 is about 3334.0937299362. The cubic root of 11116181 is about 223.1782510400.

Adding to 11116181 its reverse (18161111), we get a palindrome (29277292).

The spelling of 11116181 in words is "eleven million, one hundred sixteen thousand, one hundred eighty-one".