9649890161 has 2 divisors, whose sum is σ = 9649890162. Its totient is φ = 9649890160.

The previous prime is 9649890139. The next prime is 9649890163. The reversal of 9649890161 is 1610989469.

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., 5419168225 + 4230721936 = 73615^2 + 65044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9649890161 is a prime.

Together with 9649890163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9649890163) 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, 4824945080 + 4824945081.

It is an arithmetic number, because the mean of its divisors is an integer number (4824945081).

Almost surely, 2^9649890161 is an apocalyptic number.

It is an amenable number.

9649890161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9649890161 is an equidigital number, since it uses as much as digits as its factorization.

9649890161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 9649890161 is about 98233.8544545616. The cubic root of 9649890161 is about 2128.9924599983.

The spelling of 9649890161 in words is "nine billion, six hundred forty-nine million, eight hundred ninety thousand, one hundred sixty-one".