6531128441 has 2 divisors, whose sum is σ = 6531128442. Its totient is φ = 6531128440.

The previous prime is 6531128431. The next prime is 6531128447. The reversal of 6531128441 is 1448211356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5943793216 + 587335225 = 77096^2 + 24235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6531128441 - 2¹⁰ = 6531127417 is a prime.

It is not a weakly prime, because it can be changed into another prime (6531128447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265564220 + 3265564221.

It is an arithmetic number, because the mean of its divisors is an integer number (3265564221).

Almost surely, 2^6531128441 is an apocalyptic number.

It is an amenable number.

6531128441 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531128441 is an equidigital number, since it uses as much as digits as its factorization.

6531128441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 6531128441 is about 80815.3973015044. The cubic root of 6531128441 is about 1869.2299956390.

Adding to 6531128441 its reverse (1448211356), we get a palindrome (7979339797).

The spelling of 6531128441 in words is "six billion, five hundred thirty-one million, one hundred twenty-eight thousand, four hundred forty-one".