6531531312 has 20 divisors (see below), whose sum is σ = 16873122680. Its totient is φ = 2177177088.

The previous prime is 6531531299. The next prime is 6531531317. The reversal of 6531531312 is 2131351356.

It is a self number, because there is not a number n which added to its sum of digits gives 6531531312.

It is not an unprimeable number, because it can be changed into a prime (6531531317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68036737 + ... + 68036832.

It is an arithmetic number, because the mean of its divisors is an integer number (843656134).

Almost surely, 2^6531531312 is an apocalyptic number.

It is an amenable number.

6531531312 is an abundant number, since it is smaller than the sum of its proper divisors (10341591368).

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

6531531312 is a wasteful number, since it uses less digits than its factorization.

6531531312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136073580 (or 136073574 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 6531531312 is about 80817.8898017017. The cubic root of 6531531312 is about 1869.2684291747.

Adding to 6531531312 its reverse (2131351356), we get a palindrome (8662882668).

The spelling of 6531531312 in words is "six billion, five hundred thirty-one million, five hundred thirty-one thousand, three hundred twelve".