1311112321 has 4 divisors (see below), whose sum is σ = 1321120944. Its totient is φ = 1301103700.

The previous prime is 1311112303. The next prime is 1311112333. The reversal of 1311112321 is 1232111131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311112321 - 2¹⁹ = 1310588033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311112295 and 1311112304.

It is not an unprimeable number, because it can be changed into a prime (1311112351) 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, 5004115 + ... + 5004376.

It is an arithmetic number, because the mean of its divisors is an integer number (330280236).

Almost surely, 2^1311112321 is an apocalyptic number.

It is an amenable number.

1311112321 is a deficient number, since it is larger than the sum of its proper divisors (10008623).

1311112321 is a wasteful number, since it uses less digits than its factorization.

1311112321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10008622.

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

The square root of 1311112321 is about 36209.2850108919. The cubic root of 1311112321 is about 1094.4937843482.

Adding to 1311112321 its reverse (1232111131), we get a palindrome (2543223452).

The spelling of 1311112321 in words is "one billion, three hundred eleven million, one hundred twelve thousand, three hundred twenty-one".