1311223123 has 16 divisors (see below), whose sum is σ = 1600068096. Its totient is φ = 1050033600.

The previous prime is 1311223093. The next prime is 1311223129. The reversal of 1311223123 is 3213221131.

It is not a de Polignac number, because 1311223123 - 2⁹ = 1311222611 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 1311223123.

It is not an unprimeable number, because it can be changed into a prime (1311223129) 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 15 ways as a sum of consecutive naturals, for example, 87778 + ... + 101623.

It is an arithmetic number, because the mean of its divisors is an integer number (100004256).

Almost surely, 2^1311223123 is an apocalyptic number.

1311223123 is a deficient number, since it is larger than the sum of its proper divisors (288844973).

1311223123 is a wasteful number, since it uses less digits than its factorization.

1311223123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189474.

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

The square root of 1311223123 is about 36210.8150004940. The cubic root of 1311223123 is about 1094.5246153412.

Adding to 1311223123 its reverse (3213221131), we get a palindrome (4524444254).

The spelling of 1311223123 in words is "one billion, three hundred eleven million, two hundred twenty-three thousand, one hundred twenty-three".