6531961229 has 2 divisors, whose sum is σ = 6531961230. Its totient is φ = 6531961228.

The previous prime is 6531961157. The next prime is 6531961231. The reversal of 6531961229 is 9221691356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6500713129 + 31248100 = 80627^2 + 5590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6531961229 is a prime.

Together with 6531961231, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6531961229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531961259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265980614 + 3265980615.

It is an arithmetic number, because the mean of its divisors is an integer number (3265980615).

Almost surely, 2^6531961229 is an apocalyptic number.

It is an amenable number.

6531961229 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531961229 is an equidigital number, since it uses as much as digits as its factorization.

6531961229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 6531961229 is about 80820.5495465108. The cubic root of 6531961229 is about 1869.3094411317.

The spelling of 6531961229 in words is "six billion, five hundred thirty-one million, nine hundred sixty-one thousand, two hundred twenty-nine".