11123231111 has 4 divisors (see below), whose sum is σ = 11305579224. Its totient is φ = 10940883000.

The previous prime is 11123231083. The next prime is 11123231137. The reversal of 11123231111 is 11113232111.

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

It is a cyclic number.

It is not a de Polignac number, because 11123231111 - 2²⁶ = 11056122247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11123231111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123231011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91173965 + ... + 91174086.

It is an arithmetic number, because the mean of its divisors is an integer number (2826394806).

Almost surely, 2^11123231111 is an apocalyptic number.

11123231111 is a deficient number, since it is larger than the sum of its proper divisors (182348113).

11123231111 is an equidigital number, since it uses as much as digits as its factorization.

11123231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182348112.

The product of its digits is 36, while the sum is 17.

Adding to 11123231111 its reverse (11113232111), we get a palindrome (22236463222).

The spelling of 11123231111 in words is "eleven billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred eleven".