8131726717 has 2 divisors, whose sum is σ = 8131726718. Its totient is φ = 8131726716.

The previous prime is 8131726711. The next prime is 8131726747. The reversal of 8131726717 is 7176271318.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8125039321 + 6687396 = 90139^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 8131726717 - 2¹⁵ = 8131693949 is a prime.

It is a super-2 number, since 2×8131726717² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8131726711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4065863358 + 4065863359.

It is an arithmetic number, because the mean of its divisors is an integer number (4065863359).

Almost surely, 2^8131726717 is an apocalyptic number.

It is an amenable number.

8131726717 is a deficient number, since it is larger than the sum of its proper divisors (1).

8131726717 is an equidigital number, since it uses as much as digits as its factorization.

8131726717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 43.

The square root of 8131726717 is about 90176.0872792782. The cubic root of 8131726717 is about 2010.9175218348.

The spelling of 8131726717 in words is "eight billion, one hundred thirty-one million, seven hundred twenty-six thousand, seven hundred seventeen".