6931991832481 has 2 divisors, whose sum is σ = 6931991832482. Its totient is φ = 6931991832480.

The previous prime is 6931991832407. The next prime is 6931991832499. The reversal of 6931991832481 is 1842381991396.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6148738512225 + 783253320256 = 2479665^2 + 885016^2 .

It is a cyclic number.

It is not a de Polignac number, because 6931991832481 - 2¹⁵ = 6931991799713 is a prime.

It is a super-2 number, since 2×6931991832481² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6931991832781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3465995916240 + 3465995916241.

It is an arithmetic number, because the mean of its divisors is an integer number (3465995916241).

Almost surely, 2^{6931991832481} is an apocalyptic number.

It is an amenable number.

6931991832481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6931991832481 is an equidigital number, since it uses as much as digits as its factorization.

6931991832481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 64.

The spelling of 6931991832481 in words is "six trillion, nine hundred thirty-one billion, nine hundred ninety-one million, eight hundred thirty-two thousand, four hundred eighty-one".