1311123223 has 2 divisors, whose sum is σ = 1311123224. Its totient is φ = 1311123222.

The previous prime is 1311123221. The next prime is 1311123227. The reversal of 1311123223 is 3223211131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311123223 - 2¹ = 1311123221 is a prime.

Together with 1311123221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1311123223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311123221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655561611 + 655561612.

It is an arithmetic number, because the mean of its divisors is an integer number (655561612).

Almost surely, 2^1311123223 is an apocalyptic number.

1311123223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311123223 is an equidigital number, since it uses as much as digits as its factorization.

1311123223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 1311123223 is about 36209.4355520768. The cubic root of 1311123223 is about 1094.4968179399.

Adding to 1311123223 its reverse (3223211131), we get a palindrome (4534334354).

The spelling of 1311123223 in words is "one billion, three hundred eleven million, one hundred twenty-three thousand, two hundred twenty-three".