1320320311 has 4 divisors (see below), whose sum is σ = 1330399224. Its totient is φ = 1310241400.

The previous prime is 1320320269. The next prime is 1320320327. The reversal of 1320320311 is 1130230231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320320311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320320611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5039260 + ... + 5039521.

It is an arithmetic number, because the mean of its divisors is an integer number (332599806).

Almost surely, 2^1320320311 is an apocalyptic number.

1320320311 is a deficient number, since it is larger than the sum of its proper divisors (10078913).

1320320311 is a wasteful number, since it uses less digits than its factorization.

1320320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10078912.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1320320311 is about 36336.2121168401. The cubic root of 1320320311 is about 1097.0500327989.

Adding to 1320320311 its reverse (1130230231), we get a palindrome (2450550542).

The spelling of 1320320311 in words is "one billion, three hundred twenty million, three hundred twenty thousand, three hundred eleven".