1123231111 has 4 divisors (see below), whose sum is σ = 1125011824. Its totient is φ = 1121450400.

The previous prime is 1123231099. The next prime is 1123231117. The reversal of 1123231111 is 1111323211.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123231111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123231117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889410 + ... + 890671.

It is an arithmetic number, because the mean of its divisors is an integer number (281252956).

Almost surely, 2^1123231111 is an apocalyptic number.

1123231111 is a deficient number, since it is larger than the sum of its proper divisors (1780713).

1123231111 is an equidigital number, since it uses as much as digits as its factorization.

1123231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780712.

The product of its digits is 36, while the sum is 16.

The square root of 1123231111 is about 33514.6402487033. The cubic root of 1123231111 is about 1039.4965237438.

Adding to 1123231111 its reverse (1111323211), we get a palindrome (2234554322).

The spelling of 1123231111 in words is "one billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred eleven".