13531120432 has 40 divisors (see below), whose sum is σ = 27404897760. Its totient is φ = 6459932160.

The previous prime is 13531120423. The next prime is 13531120451. The reversal of 13531120432 is 23402113531.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13531120397 and 13531120406.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177082 + ... + 241702.

It is an arithmetic number, because the mean of its divisors is an integer number (685122444).

Almost surely, 2^13531120432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13531120432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13702448880).

13531120432 is an abundant number, since it is smaller than the sum of its proper divisors (13873777328).

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

13531120432 is a wasteful number, since it uses less digits than its factorization.

13531120432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65221 (or 65215 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 13531120432 its reverse (23402113531), we get a palindrome (36933233963).

The spelling of 13531120432 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty thousand, four hundred thirty-two".