6531005421 has 24 divisors (see below), whose sum is σ = 9688838016. Its totient is φ = 4236986880.

The previous prime is 6531005389. The next prime is 6531005473. The reversal of 6531005421 is 1245001356.

6531005421 is a `hidden beast` number, since 653 + 1 + 0 + 0 + 5 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 6531005421 - 2⁵ = 6531005389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531007421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73741 + ... + 136013.

It is an arithmetic number, because the mean of its divisors is an integer number (403701584).

Almost surely, 2^6531005421 is an apocalyptic number.

It is an amenable number.

6531005421 is a deficient number, since it is larger than the sum of its proper divisors (3157832595).

6531005421 is a wasteful number, since it uses less digits than its factorization.

6531005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62593 (or 62590 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 6531005421 is about 80814.6361805830. The cubic root of 6531005421 is about 1869.2182593252.

Adding to 6531005421 its reverse (1245001356), we get a palindrome (7776006777).

The spelling of 6531005421 in words is "six billion, five hundred thirty-one million, five thousand, four hundred twenty-one".