9663681 has 8 divisors (see below), whose sum is σ = 13096384. Its totient is φ = 6336720.

The previous prime is 9663679. The next prime is 9663683. The reversal of 9663681 is 1863669.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9663679) and next prime (9663683).

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

It is not a de Polignac number, because 9663681 - 2¹ = 9663679 is a prime.

It is a super-2 number, since 2×9663681² = 186773460939522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9663683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26221 + ... + 26586.

It is an arithmetic number, because the mean of its divisors is an integer number (1637048).

Almost surely, 2^9663681 is an apocalyptic number.

It is an amenable number.

9663681 is a deficient number, since it is larger than the sum of its proper divisors (3432703).

9663681 is a wasteful number, since it uses less digits than its factorization.

9663681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52871.

The product of its digits is 46656, while the sum is 39.

The square root of 9663681 is about 3108.6461683505. The cubic root of 9663681 is about 213.0006171597. Note that the first 3 decimals are identical.

The spelling of 9663681 in words is "nine million, six hundred sixty-three thousand, six hundred eighty-one".