6531961157 has 2 divisors, whose sum is σ = 6531961158. Its totient is φ = 6531961156.

The previous prime is 6531961133. The next prime is 6531961229. The reversal of 6531961157 is 7511691356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5530301956 + 1001659201 = 74366^2 + 31649^2 .

It is a cyclic number.

It is not a de Polignac number, because 6531961157 - 2²⁸ = 6263525701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531961757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265980578 + 3265980579.

It is an arithmetic number, because the mean of its divisors is an integer number (3265980579).

Almost surely, 2^6531961157 is an apocalyptic number.

It is an amenable number.

6531961157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531961157 is an equidigital number, since it uses as much as digits as its factorization.

6531961157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 44.

The square root of 6531961157 is about 80820.5491010795. The cubic root of 6531961157 is about 1869.3094342634.

The spelling of 6531961157 in words is "six billion, five hundred thirty-one million, nine hundred sixty-one thousand, one hundred fifty-seven".