1123223111 has 2 divisors, whose sum is σ = 1123223112. Its totient is φ = 1123223110.

The previous prime is 1123223071. The next prime is 1123223113. The reversal of 1123223111 is 1113223211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1123223111 - 2⁶ = 1123223047 is a prime.

Together with 1123223113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1123223111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123223113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561611555 + 561611556.

It is an arithmetic number, because the mean of its divisors is an integer number (561611556).

Almost surely, 2^1123223111 is an apocalyptic number.

1123223111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123223111 is an equidigital number, since it uses as much as digits as its factorization.

1123223111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 1123223111 is about 33514.5208976646. The cubic root of 1123223111 is about 1039.4940558659.

Adding to 1123223111 its reverse (1113223211), we get a palindrome (2236446322).

It can be divided in two parts, 11232 and 23111, that added together give a palindrome (34343).

The spelling of 1123223111 in words is "one billion, one hundred twenty-three million, two hundred twenty-three thousand, one hundred eleven".