8178127481 has 2 divisors, whose sum is σ = 8178127482. Its totient is φ = 8178127480.

The previous prime is 8178127357. The next prime is 8178127487. The reversal of 8178127481 is 1847218718.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5804001856 + 2374125625 = 76184^2 + 48725^2 .

It is a cyclic number.

It is not a de Polignac number, because 8178127481 - 2¹⁸ = 8177865337 is a prime.

It is a super-2 number, since 2×8178127481² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8178127487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4089063740 + 4089063741.

It is an arithmetic number, because the mean of its divisors is an integer number (4089063741).

Almost surely, 2^8178127481 is an apocalyptic number.

It is an amenable number.

8178127481 is a deficient number, since it is larger than the sum of its proper divisors (1).

8178127481 is an equidigital number, since it uses as much as digits as its factorization.

8178127481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 47.

The square root of 8178127481 is about 90432.9999557684. Note that the first 4 decimals coincide. The cubic root of 8178127481 is about 2014.7351281369.

The spelling of 8178127481 in words is "eight billion, one hundred seventy-eight million, one hundred twenty-seven thousand, four hundred eighty-one".