11131121 has 4 divisors (see below), whose sum is σ = 11150244. Its totient is φ = 11112000.

The previous prime is 11131111. The next prime is 11131123. The reversal of 11131121 is 12113111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12113111 = 23 ⋅526657.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 640000 = 3239^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131121 - 2¹⁴ = 11114737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11131123) 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, 8660 + ... + 9861.

It is an arithmetic number, because the mean of its divisors is an integer number (2787561).

Almost surely, 2^11131121 is an apocalyptic number.

It is an amenable number.

11131121 is a deficient number, since it is larger than the sum of its proper divisors (19123).

11131121 is an equidigital number, since it uses as much as digits as its factorization.

11131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19122.

The product of its digits is 6, while the sum is 11.

The square root of 11131121 is about 3336.3334665468. Note that the first 3 decimals coincide. The cubic root of 11131121 is about 223.2781891525.

Adding to 11131121 its reverse (12113111), we get a palindrome (23244232).

The spelling of 11131121 in words is "eleven million, one hundred thirty-one thousand, one hundred twenty-one".