1123313111 has 4 divisors (see below), whose sum is σ = 1144507752. Its totient is φ = 1102118472.

The previous prime is 1123313099. The next prime is 1123313129. The reversal of 1123313111 is 1113133211.

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 1123313111 - 2²² = 1119118807 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 1123313111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123313161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10597241 + ... + 10597346.

It is an arithmetic number, because the mean of its divisors is an integer number (286126938).

Almost surely, 2^1123313111 is an apocalyptic number.

1123313111 is a deficient number, since it is larger than the sum of its proper divisors (21194641).

1123313111 is an equidigital number, since it uses as much as digits as its factorization.

1123313111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21194640.

The product of its digits is 54, while the sum is 17.

The square root of 1123313111 is about 33515.8635723444. The cubic root of 1123313111 is about 1039.5218188174.

Adding to 1123313111 its reverse (1113133211), we get a palindrome (2236446322).

The spelling of 1123313111 in words is "one billion, one hundred twenty-three million, three hundred thirteen thousand, one hundred eleven".