9885661 has 4 divisors (see below), whose sum is σ = 9898524. Its totient is φ = 9872800.

The previous prime is 9885647. The next prime is 9885727. The reversal of 9885661 is 1665889.

9885661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4452100 + 5433561 = 2110^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 9885661 - 2²³ = 1497053 is a prime.

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 (9885611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5200 + ... + 6841.

It is an arithmetic number, because the mean of its divisors is an integer number (2474631).

Almost surely, 2^9885661 is an apocalyptic number.

It is an amenable number.

9885661 is a deficient number, since it is larger than the sum of its proper divisors (12863).

9885661 is a wasteful number, since it uses less digits than its factorization.

9885661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12862.

The product of its digits is 103680, while the sum is 43.

The square root of 9885661 is about 3144.1471021566. The cubic root of 9885661 is about 214.6191997442.

The spelling of 9885661 in words is "nine million, eight hundred eighty-five thousand, six hundred sixty-one".