9861681 has 8 divisors (see below), whose sum is σ = 13428864. Its totient is φ = 6434480.

The previous prime is 9861679. The next prime is 9861697. The reversal of 9861681 is 1861689.

9861681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9861681 - 2¹ = 9861679 is a prime.

It is a super-2 number, since 2×9861681² = 194505504291522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9861611) 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, 34830 + ... + 35111.

It is an arithmetic number, because the mean of its divisors is an integer number (1678608).

Almost surely, 2^9861681 is an apocalyptic number.

It is an amenable number.

9861681 is a deficient number, since it is larger than the sum of its proper divisors (3567183).

9861681 is a wasteful number, since it uses less digits than its factorization.

9861681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69991.

The product of its digits is 20736, while the sum is 39.

The square root of 9861681 is about 3140.3313519436. The cubic root of 9861681 is about 214.4455227578.

The spelling of 9861681 in words is "nine million, eight hundred sixty-one thousand, six hundred eighty-one".