9718961281 has 8 divisors (see below), whose sum is σ = 9743874728. Its totient is φ = 9694080000.

The previous prime is 9718961279. The next prime is 9718961321. The reversal of 9718961281 is 1821698179.

It can be written as a sum of positive squares in 4 ways, for example, as 6662640625 + 3056320656 = 81625^2 + 55284^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9718961281 - 2¹ = 9718961279 is a prime.

It is a super-2 number, since 2×9718961281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9718961261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667681 + ... + 682081.

It is an arithmetic number, because the mean of its divisors is an integer number (1217984341).

Almost surely, 2^9718961281 is an apocalyptic number.

It is an amenable number.

9718961281 is a deficient number, since it is larger than the sum of its proper divisors (24913447).

9718961281 is a wasteful number, since it uses less digits than its factorization.

9718961281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16083.

The product of its digits is 435456, while the sum is 52.

The square root of 9718961281 is about 98584.7923414154. The cubic root of 9718961281 is about 2134.0599591494.

The spelling of 9718961281 in words is "nine billion, seven hundred eighteen million, nine hundred sixty-one thousand, two hundred eighty-one".