6531130872 has 64 divisors (see below), whose sum is σ = 20733753600. Its totient is φ = 1866036960.

The previous prime is 6531130849. The next prime is 6531130901. The reversal of 6531130872 is 2780311356.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2158254 + ... + 2161277.

It is an arithmetic number, because the mean of its divisors is an integer number (323964900).

Almost surely, 2^6531130872 is an apocalyptic number.

It is an amenable number.

6531130872 is an abundant number, since it is smaller than the sum of its proper divisors (14202622728).

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

6531130872 is a wasteful number, since it uses less digits than its factorization.

6531130872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319553 (or 4319543 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 6531130872 is about 80815.4123419537. The cubic root of 6531130872 is about 1869.2302275590.

The spelling of 6531130872 in words is "six billion, five hundred thirty-one million, one hundred thirty thousand, eight hundred seventy-two".