1311321320 has 32 divisors (see below), whose sum is σ = 2994516000. Its totient is φ = 516698688.

The previous prime is 1311321311. The next prime is 1311321337. The reversal of 1311321320 is 231231131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241970 + ... + 247329.

It is an arithmetic number, because the mean of its divisors is an integer number (93578625).

Almost surely, 2^1311321320 is an apocalyptic number.

1311321320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311321320 is an abundant number, since it is smaller than the sum of its proper divisors (1683194680).

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

1311321320 is a wasteful number, since it uses less digits than its factorization.

1311321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489377 (or 489373 counting only the distinct ones).

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

The square root of 1311321320 is about 36212.1708821772. The cubic root of 1311321320 is about 1094.5519375029.

Adding to 1311321320 its reverse (231231131), we get a palindrome (1542552451).

The spelling of 1311321320 in words is "one billion, three hundred eleven million, three hundred twenty-one thousand, three hundred twenty".