6531838561 has 8 divisors (see below), whose sum is σ = 6660282024. Its totient is φ = 6403587840.

The previous prime is 6531838543. The next prime is 6531838571. The reversal of 6531838561 is 1658381356.

6531838561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3895632225 + 2636206336 = 62415^2 + 51344^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6531838561 - 2¹⁵ = 6531805793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6531838531) 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, 21231 + ... + 116251.

It is an arithmetic number, because the mean of its divisors is an integer number (832535253).

Almost surely, 2^6531838561 is an apocalyptic number.

It is an amenable number.

6531838561 is a deficient number, since it is larger than the sum of its proper divisors (128443463).

6531838561 is a wasteful number, since it uses less digits than its factorization.

6531838561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96371.

The product of its digits is 518400, while the sum is 46.

The square root of 6531838561 is about 80819.7906517952. The cubic root of 6531838561 is about 1869.2977393942.

The spelling of 6531838561 in words is "six billion, five hundred thirty-one million, eight hundred thirty-eight thousand, five hundred sixty-one".