9996821161 has 2 divisors, whose sum is σ = 9996821162. Its totient is φ = 9996821160.

The previous prime is 9996821147. The next prime is 9996821183. The reversal of 9996821161 is 1611286999.

It is a happy number.

9996821161 is digitally balanced in base 3, because in such base 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., 9948865536 + 47955625 = 99744^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 9996821161 - 2⁷ = 9996821033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9996821099 and 9996821108.

It is not a weakly prime, because it can be changed into another prime (9996821561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998410580 + 4998410581.

It is an arithmetic number, because the mean of its divisors is an integer number (4998410581).

Almost surely, 2^9996821161 is an apocalyptic number.

It is an amenable number.

9996821161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9996821161 is an equidigital number, since it uses as much as digits as its factorization.

9996821161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 52.

The square root of 9996821161 is about 99984.1045416720. The cubic root of 9996821161 is about 2154.2063791375.

The spelling of 9996821161 in words is "nine billion, nine hundred ninety-six million, eight hundred twenty-one thousand, one hundred sixty-one".