13531203520 has 56 divisors (see below), whose sum is σ = 32335250544. Its totient is φ = 5393319936.

The previous prime is 13531203481. The next prime is 13531203541. The reversal of 13531203520 is 2530213531.

It is a congruent number.

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, 15852 + ... + 165268.

Almost surely, 2^13531203520 is an apocalyptic number.

13531203520 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 13531203520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16167625272).

13531203520 is an abundant number, since it is smaller than the sum of its proper divisors (18804047024).

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

13531203520 is a wasteful number, since it uses less digits than its factorization.

13531203520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149717 (or 149707 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The spelling of 13531203520 in words is "thirteen billion, five hundred thirty-one million, two hundred three thousand, five hundred twenty".