11811121 has 8 divisors (see below), whose sum is σ = 14085504. Its totient is φ = 9683520.

The previous prime is 11811109. The next prime is 11811187. The reversal of 11811121 is 12111811.

11811121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11811121 - 2⁵ = 11811089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11811095 and 11811104.

It is not an unprimeable number, because it can be changed into a prime (11811221) 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 7 ways as a sum of consecutive naturals, for example, 36520 + ... + 36841.

It is an arithmetic number, because the mean of its divisors is an integer number (1760688).

Almost surely, 2^11811121 is an apocalyptic number.

It is an amenable number.

11811121 is a deficient number, since it is larger than the sum of its proper divisors (2274383).

11811121 is an equidigital number, since it uses as much as digits as its factorization.

11811121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73391.

The product of its digits is 16, while the sum is 16.

The square root of 11811121 is about 3436.7311503811. The cubic root of 11811121 is about 227.7353102046.

Adding to 11811121 its reverse (12111811), we get a palindrome (23922932).

The spelling of 11811121 in words is "eleven million, eight hundred eleven thousand, one hundred twenty-one".