6531137313791 has 2 divisors, whose sum is σ = 6531137313792. Its totient is φ = 6531137313790.

The previous prime is 6531137313781. The next prime is 6531137313803. The reversal of 6531137313791 is 1973137311356.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6531137313791 - 2¹⁴ = 6531137297407 is a prime.

It is a super-2 number, since 2×6531137313791² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531137313781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265568656895 + 3265568656896.

It is an arithmetic number, because the mean of its divisors is an integer number (3265568656896).

Almost surely, 2^{6531137313791} is an apocalyptic number.

6531137313791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531137313791 is an equidigital number, since it uses as much as digits as its factorization.

6531137313791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1071630, while the sum is 50.

The spelling of 6531137313791 in words is "six trillion, five hundred thirty-one billion, one hundred thirty-seven million, three hundred thirteen thousand, seven hundred ninety-one".