9718961321 has 2 divisors, whose sum is σ = 9718961322. Its totient is φ = 9718961320.

The previous prime is 9718961279. The next prime is 9718961327. The reversal of 9718961321 is 1231698179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8192965225 + 1525996096 = 90515^2 + 39064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9718961321 is a prime.

It is not a weakly prime, because it can be changed into another prime (9718961327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4859480660 + 4859480661.

It is an arithmetic number, because the mean of its divisors is an integer number (4859480661).

Almost surely, 2^9718961321 is an apocalyptic number.

It is an amenable number.

9718961321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9718961321 is an equidigital number, since it uses as much as digits as its factorization.

9718961321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 9718961321 is about 98584.7925442865. The cubic root of 9718961321 is about 2134.0599620771.

The spelling of 9718961321 in words is "nine billion, seven hundred eighteen million, nine hundred sixty-one thousand, three hundred twenty-one".