1320312311 has 4 divisors (see below), whose sum is σ = 1321572000. Its totient is φ = 1319052624.

The previous prime is 1320312307. The next prime is 1320312341. The reversal of 1320312311 is 1132130231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320312311 - 2² = 1320312307 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 1320312311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320312341) 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, 628271 + ... + 630368.

It is an arithmetic number, because the mean of its divisors is an integer number (330393000).

Almost surely, 2^1320312311 is an apocalyptic number.

1320312311 is a deficient number, since it is larger than the sum of its proper divisors (1259689).

1320312311 is a wasteful number, since it uses less digits than its factorization.

1320312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259688.

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

The square root of 1320312311 is about 36336.1020336524. The cubic root of 1320312311 is about 1097.0478170694.

Adding to 1320312311 its reverse (1132130231), we get a palindrome (2452442542).

The spelling of 1320312311 in words is "one billion, three hundred twenty million, three hundred twelve thousand, three hundred eleven".