1311020320 has 24 divisors (see below), whose sum is σ = 3097285884. Its totient is φ = 524408064.

The previous prime is 1311020279. The next prime is 1311020323. The reversal of 1311020320 is 230201131.

It can be written as a sum of positive squares in 2 ways, for example, as 1262523024 + 48497296 = 35532^2 + 6964^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1311020320.

It is not an unprimeable number, because it can be changed into a prime (1311020323) 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 3 ways as a sum of consecutive naturals, for example, 4096779 + ... + 4097098.

Almost surely, 2^1311020320 is an apocalyptic number.

1311020320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311020320 is an abundant number, since it is smaller than the sum of its proper divisors (1786265564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311020320 is an equidigital number, since it uses as much as digits as its factorization.

1311020320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193892 (or 8193884 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1311020320 is about 36208.0145824098. The cubic root of 1311020320 is about 1094.4681834707.

Adding to 1311020320 its reverse (230201131), we get a palindrome (1541221451).

The spelling of 1311020320 in words is "one billion, three hundred eleven million, twenty thousand, three hundred twenty".