8128281613 has 2 divisors, whose sum is σ = 8128281614. Its totient is φ = 8128281612.

The previous prime is 8128281599. The next prime is 8128281641. The reversal of 8128281613 is 3161828218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8114046084 + 14235529 = 90078^2 + 3773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8128281613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8128251613) 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, 4064140806 + 4064140807.

It is an arithmetic number, because the mean of its divisors is an integer number (4064140807).

Almost surely, 2^8128281613 is an apocalyptic number.

It is an amenable number.

8128281613 is a deficient number, since it is larger than the sum of its proper divisors (1).

8128281613 is an equidigital number, since it uses as much as digits as its factorization.

8128281613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 40.

The square root of 8128281613 is about 90156.9831627035. The cubic root of 8128281613 is about 2010.6334985754.

The spelling of 8128281613 in words is "eight billion, one hundred twenty-eight million, two hundred eighty-one thousand, six hundred thirteen".