6951316781 has 2 divisors, whose sum is σ = 6951316782. Its totient is φ = 6951316780.

The previous prime is 6951316777. The next prime is 6951316789. The reversal of 6951316781 is 1876131596.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6800641156 + 150675625 = 82466^2 + 12275^2 .

It is a cyclic number.

It is not a de Polignac number, because 6951316781 - 2² = 6951316777 is a prime.

It is a super-2 number, since 2×6951316781² = 96641609979624403922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6951316789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3475658390 + 3475658391.

It is an arithmetic number, because the mean of its divisors is an integer number (3475658391).

Almost surely, 2^6951316781 is an apocalyptic number.

It is an amenable number.

6951316781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6951316781 is an equidigital number, since it uses as much as digits as its factorization.

6951316781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 6951316781 is about 83374.5571562452. The cubic root of 6951316781 is about 1908.4862123544.

The spelling of 6951316781 in words is "six billion, nine hundred fifty-one million, three hundred sixteen thousand, seven hundred eighty-one".