9986920813 has 2 divisors, whose sum is σ = 9986920814. Its totient is φ = 9986920812.

The previous prime is 9986920787. The next prime is 9986920943. The reversal of 9986920813 is 3180296899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8679158244 + 1307762569 = 93162^2 + 36163^2 .

It is a cyclic number.

It is not a de Polignac number, because 9986920813 - 2⁹ = 9986920301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9986924813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993460406 + 4993460407.

It is an arithmetic number, because the mean of its divisors is an integer number (4993460407).

Almost surely, 2^9986920813 is an apocalyptic number.

It is an amenable number.

9986920813 is a deficient number, since it is larger than the sum of its proper divisors (1).

9986920813 is an equidigital number, since it uses as much as digits as its factorization.

9986920813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 9986920813 is about 99934.5826678633. The cubic root of 9986920813 is about 2153.4950050959.

The spelling of 9986920813 in words is "nine billion, nine hundred eighty-six million, nine hundred twenty thousand, eight hundred thirteen".