9618563281 has 2 divisors, whose sum is σ = 9618563282. Its totient is φ = 9618563280.

The previous prime is 9618563261. The next prime is 9618563341. The reversal of 9618563281 is 1823658169.

9618563281 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8641375681 + 977187600 = 92959^2 + 31260^2 .

It is an emirp because it is prime and its reverse (1823658169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9618563281 - 2⁷ = 9618563153 is a prime.

It is a super-2 number, since 2×9618563281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9618563221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4809281640 + 4809281641.

It is an arithmetic number, because the mean of its divisors is an integer number (4809281641).

Almost surely, 2^9618563281 is an apocalyptic number.

It is an amenable number.

9618563281 is a deficient number, since it is larger than the sum of its proper divisors (1).

9618563281 is an equidigital number, since it uses as much as digits as its factorization.

9618563281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The square root of 9618563281 is about 98074.2743077918. The cubic root of 9618563281 is about 2126.6861472842.

The spelling of 9618563281 in words is "nine billion, six hundred eighteen million, five hundred sixty-three thousand, two hundred eighty-one".