11581331112 has 96 divisors (see below), whose sum is σ = 34206681600. Its totient is φ = 3518356608.

The previous prime is 11581331101. The next prime is 11581331123. The reversal of 11581331112 is 21113318511.

It is an interprime number because it is at equal distance from previous prime (11581331101) and next prime (11581331123).

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, 4368 + ... + 152255.

It is an arithmetic number, because the mean of its divisors is an integer number (356319600).

Almost surely, 2^11581331112 is an apocalyptic number.

11581331112 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 11581331112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17103340800).

11581331112 is an abundant number, since it is smaller than the sum of its proper divisors (22625350488).

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

11581331112 is a wasteful number, since it uses less digits than its factorization.

11581331112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156727 (or 156720 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

Adding to 11581331112 its reverse (21113318511), we get a palindrome (32694649623).

The spelling of 11581331112 in words is "eleven billion, five hundred eighty-one million, three hundred thirty-one thousand, one hundred twelve".