9985681 has 8 divisors (see below), whose sum is σ = 10622664. Its totient is φ = 9354240.

The previous prime is 9985669. The next prime is 9985693. The reversal of 9985681 is 1865899.

It is an interprime number because it is at equal distance from previous prime (9985669) and next prime (9985693).

It can be written as a sum of positive squares in 4 ways, for example, as 81 + 9985600 = 9^2 + 3160^2 .

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 9985681 - 2⁵ = 9985649 is a prime.

It is a super-2 number, since 2×9985681² = 199427650067522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985601) 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, 2701 + ... + 5221.

It is an arithmetic number, because the mean of its divisors is an integer number (1327833).

Almost surely, 2^9985681 is an apocalyptic number.

It is an amenable number.

9985681 is a deficient number, since it is larger than the sum of its proper divisors (636983).

9985681 is a wasteful number, since it uses less digits than its factorization.

9985681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771.

The product of its digits is 155520, while the sum is 46.

The square root of 9985681 is about 3160.0128164297. The cubic root of 9985681 is about 215.3405887150.

It can be divided in two parts, 99856 and 81, that multiplied together give a square (8088336 = 2844²).

The spelling of 9985681 in words is "nine million, nine hundred eighty-five thousand, six hundred eighty-one".