1311233320 has 32 divisors (see below), whose sum is σ = 3105554400. Its totient is φ = 496888128.

The previous prime is 1311233317. The next prime is 1311233321. The reversal of 1311233320 is 233321131.

It is a super-3 number, since 3×1311233320³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1311233321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 861894 + ... + 863413.

It is an arithmetic number, because the mean of its divisors is an integer number (97048575).

Almost surely, 2^1311233320 is an apocalyptic number.

1311233320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311233320 is an abundant number, since it is smaller than the sum of its proper divisors (1794321080).

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

1311233320 is a wasteful number, since it uses less digits than its factorization.

1311233320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725337 (or 1725333 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1311233320 is about 36210.9558006966. The cubic root of 1311233320 is about 1094.5274526001.

Adding to 1311233320 its reverse (233321131), we get a palindrome (1544554451).

The spelling of 1311233320 in words is "one billion, three hundred eleven million, two hundred thirty-three thousand, three hundred twenty".