13531136988 has 24 divisors (see below), whose sum is σ = 31627387792. Its totient is φ = 4502559744.

The previous prime is 13531136909. The next prime is 13531136989. The reversal of 13531136988 is 88963113531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531136989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970195 + ... + 984042.

Almost surely, 2^13531136988 is an apocalyptic number.

It is an amenable number.

13531136988 is an abundant number, since it is smaller than the sum of its proper divisors (18096250804).

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

13531136988 is a wasteful number, since it uses less digits than its factorization.

13531136988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954821 (or 1954819 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The spelling of 13531136988 in words is "thirteen billion, five hundred thirty-one million, one hundred thirty-six thousand, nine hundred eighty-eight".