9986481961 has 2 divisors, whose sum is σ = 9986481962. Its totient is φ = 9986481960.

The previous prime is 9986481937. The next prime is 9986481983. The reversal of 9986481961 is 1691846899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9276579225 + 709902736 = 96315^2 + 26644^2 .

It is an emirp because it is prime and its reverse (1691846899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9986481961 - 2³¹ = 7838998313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9986481961.

It is not a weakly prime, because it can be changed into another prime (9986481991) 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, 4993240980 + 4993240981.

It is an arithmetic number, because the mean of its divisors is an integer number (4993240981).

Almost surely, 2^9986481961 is an apocalyptic number.

It is an amenable number.

9986481961 is a deficient number, since it is larger than the sum of its proper divisors (1).

9986481961 is an equidigital number, since it uses as much as digits as its factorization.

9986481961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 61.

The square root of 9986481961 is about 99932.3869473756. The cubic root of 9986481961 is about 2153.4634611913.

The spelling of 9986481961 in words is "nine billion, nine hundred eighty-six million, four hundred eighty-one thousand, nine hundred sixty-one".