8126081281 has 2 divisors, whose sum is σ = 8126081282. Its totient is φ = 8126081280.

The previous prime is 8126081261. The next prime is 8126081297. The reversal of 8126081281 is 1821806218.

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., 8118010000 + 8071281 = 90100^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 8126081281 - 2¹⁹ = 8125556993 is a prime.

It is a super-2 number, since 2×8126081281² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8126081281.

It is not a weakly prime, because it can be changed into another prime (8126081261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4063040640 + 4063040641.

It is an arithmetic number, because the mean of its divisors is an integer number (4063040641).

Almost surely, 2^8126081281 is an apocalyptic number.

It is an amenable number.

8126081281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8126081281 is an equidigital number, since it uses as much as digits as its factorization.

8126081281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 8126081281 is about 90144.7795548916. The cubic root of 8126081281 is about 2010.4520555310.

Adding to 8126081281 its reverse (1821806218), we get a palindrome (9947887499).

The spelling of 8126081281 in words is "eight billion, one hundred twenty-six million, eighty-one thousand, two hundred eighty-one".