9961136917 has 2 divisors, whose sum is σ = 9961136918. Its totient is φ = 9961136916.

The previous prime is 9961136879. The next prime is 9961136987. The reversal of 9961136917 is 7196311699.

It is a happy number.

9961136917 is digitally balanced in base 2, 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., 8156076721 + 1805060196 = 90311^2 + 42486^2 .

It is an emirp because it is prime and its reverse (7196311699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9961136917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9961136987) 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, 4980568458 + 4980568459.

It is an arithmetic number, because the mean of its divisors is an integer number (4980568459).

Almost surely, 2^9961136917 is an apocalyptic number.

It is an amenable number.

9961136917 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961136917 is an equidigital number, since it uses as much as digits as its factorization.

9961136917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 52.

The square root of 9961136917 is about 99805.4954248512. The cubic root of 9961136917 is about 2151.6401342583.

The spelling of 9961136917 in words is "nine billion, nine hundred sixty-one million, one hundred thirty-six thousand, nine hundred seventeen".