11531331120 has 160 divisors (see below), whose sum is σ = 36336960000. Its totient is φ = 3024525312.

The previous prime is 11531331109. The next prime is 11531331157. The reversal of 11531331120 is 2113313511.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8741821 + ... + 8743139.

It is an arithmetic number, because the mean of its divisors is an integer number (227106000).

Almost surely, 2^11531331120 is an apocalyptic number.

11531331120 is a gapful number since it is divisible by the number (10) 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 11531331120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18168480000).

11531331120 is an abundant number, since it is smaller than the sum of its proper divisors (24805628880).

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

11531331120 is a wasteful number, since it uses less digits than its factorization.

11531331120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907 (or 1901 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 21.

Adding to 11531331120 its reverse (2113313511), we get a palindrome (13644644631).

The spelling of 11531331120 in words is "eleven billion, five hundred thirty-one million, three hundred thirty-one thousand, one hundred twenty".