9961136879 has 2 divisors, whose sum is σ = 9961136880. Its totient is φ = 9961136878.

The previous prime is 9961136873. The next prime is 9961136917. The reversal of 9961136879 is 9786311699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9961136879 - 2⁴ = 9961136863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9961136873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980568439 + 4980568440.

It is an arithmetic number, because the mean of its divisors is an integer number (4980568440).

Almost surely, 2^9961136879 is an apocalyptic number.

9961136879 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961136879 is an equidigital number, since it uses as much as digits as its factorization.

9961136879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 9961136879 is about 99805.4952344810. The cubic root of 9961136879 is about 2151.6401315223.

The spelling of 9961136879 in words is "nine billion, nine hundred sixty-one million, one hundred thirty-six thousand, eight hundred seventy-nine".