1311311232 has 192 divisors, whose sum is σ = 4704860160. Its totient is φ = 340577280.

The previous prime is 1311311189. The next prime is 1311311263. The reversal of 1311311232 is 2321131131.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81313 + ... + 96095.

It is an arithmetic number, because the mean of its divisors is an integer number (24504480).

Almost surely, 2^1311311232 is an apocalyptic number.

1311311232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311311232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2352430080).

1311311232 is an abundant number, since it is smaller than the sum of its proper divisors (3393548928).

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

1311311232 is a wasteful number, since it uses less digits than its factorization.

1311311232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14821 (or 14806 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1311311232 is about 36212.0315917238. The cubic root of 1311311232 is about 1094.5491306983.

Adding to 1311311232 its reverse (2321131131), we get a palindrome (3632442363).

The spelling of 1311311232 in words is "one billion, three hundred eleven million, three hundred eleven thousand, two hundred thirty-two".