9965493281 has 2 divisors, whose sum is σ = 9965493282. Its totient is φ = 9965493280.

The previous prime is 9965493259. The next prime is 9965493289. The reversal of 9965493281 is 1823945699.

9965493281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9485006881 + 480486400 = 97391^2 + 21920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9965493281 is a prime.

It is a super-2 number, since 2×9965493281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9965493289) 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, 4982746640 + 4982746641.

It is an arithmetic number, because the mean of its divisors is an integer number (4982746641).

Almost surely, 2^9965493281 is an apocalyptic number.

It is an amenable number.

9965493281 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965493281 is an equidigital number, since it uses as much as digits as its factorization.

9965493281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 56.

The square root of 9965493281 is about 99827.3173084402. The cubic root of 9965493281 is about 2151.9537517902.

The spelling of 9965493281 in words is "nine billion, nine hundred sixty-five million, four hundred ninety-three thousand, two hundred eighty-one".