6531961133 has 2 divisors, whose sum is σ = 6531961134. Its totient is φ = 6531961132.

The previous prime is 6531961081. The next prime is 6531961157. The reversal of 6531961133 is 3311691356.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6068721604 + 463239529 = 77902^2 + 21523^2 .

It is a cyclic number.

It is not a de Polignac number, because 6531961133 - 2¹² = 6531957037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531961333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265980566 + 3265980567.

It is an arithmetic number, because the mean of its divisors is an integer number (3265980567).

Almost surely, 2^6531961133 is an apocalyptic number.

It is an amenable number.

6531961133 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531961133 is an equidigital number, since it uses as much as digits as its factorization.

6531961133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 38.

The square root of 6531961133 is about 80820.5489526024. The cubic root of 6531961133 is about 1869.3094319739.

The spelling of 6531961133 in words is "six billion, five hundred thirty-one million, nine hundred sixty-one thousand, one hundred thirty-three".