9684863981 has 8 divisors (see below), whose sum is σ = 10433422104. Its totient is φ = 8936815680.

The previous prime is 9684863971. The next prime is 9684863987. The reversal of 9684863981 is 1893684869.

It can be written as a sum of positive squares in 4 ways, for example, as 131560900 + 9553303081 = 11470^2 + 97741^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-9684863981 is a prime.

It is a super-2 number, since 2×9684863981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9684863987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87530 + ... + 164411.

It is an arithmetic number, because the mean of its divisors is an integer number (1304177763).

Almost surely, 2^9684863981 is an apocalyptic number.

It is an amenable number.

9684863981 is a deficient number, since it is larger than the sum of its proper divisors (748558123).

9684863981 is a wasteful number, since it uses less digits than its factorization.

9684863981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254911.

The product of its digits is 17915904, while the sum is 62.

The square root of 9684863981 is about 98411.7065241732. The cubic root of 9684863981 is about 2131.5613744389.

The spelling of 9684863981 in words is "nine billion, six hundred eighty-four million, eight hundred sixty-three thousand, nine hundred eighty-one".