1311320321 has 8 divisors (see below), whose sum is σ = 1440352320. Its totient is φ = 1188289872.

The previous prime is 1311320299. The next prime is 1311320323. The reversal of 1311320321 is 1230231131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311320321 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 1311320321.

It is not an unprimeable number, because it can be changed into a prime (1311320323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1499930 + ... + 1500803.

It is an arithmetic number, because the mean of its divisors is an integer number (180044040).

Almost surely, 2^1311320321 is an apocalyptic number.

It is an amenable number.

1311320321 is a deficient number, since it is larger than the sum of its proper divisors (129031999).

1311320321 is a wasteful number, since it uses less digits than its factorization.

1311320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000775.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1311320321 is about 36212.1570884696. The cubic root of 1311320321 is about 1094.5516595498.

Adding to 1311320321 its reverse (1230231131), we get a palindrome (2541551452).

The spelling of 1311320321 in words is "one billion, three hundred eleven million, three hundred twenty thousand, three hundred twenty-one".