1311233331 has 4 divisors (see below), whose sum is σ = 1748311112. Its totient is φ = 874155552.

The previous prime is 1311233327. The next prime is 1311233333. The reversal of 1311233331 is 1333321131.

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

It is not a de Polignac number, because 1311233331 - 2² = 1311233327 is a prime.

It is a super-3 number, since 3×1311233331³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311233298 and 1311233307.

It is not an unprimeable number, because it can be changed into a prime (1311233333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218538886 + ... + 218538891.

It is an arithmetic number, because the mean of its divisors is an integer number (437077778).

Almost surely, 2^1311233331 is an apocalyptic number.

1311233331 is a deficient number, since it is larger than the sum of its proper divisors (437077781).

1311233331 is an equidigital number, since it uses as much as digits as its factorization.

1311233331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437077780.

The product of its digits is 486, while the sum is 21.

The square root of 1311233331 is about 36210.9559525843. The cubic root of 1311233331 is about 1094.5274556608.

Adding to 1311233331 its reverse (1333321131), we get a palindrome (2644554462).

The spelling of 1311233331 in words is "one billion, three hundred eleven million, two hundred thirty-three thousand, three hundred thirty-one".