9899561 has 8 divisors (see below), whose sum is σ = 11338560. Its totient is φ = 8466768.

The previous prime is 9899531. The next prime is 9899567. The reversal of 9899561 is 1659989.

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 9899561 - 2⁶ = 9899497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9899567) 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, 2630 + ... + 5168.

It is an arithmetic number, because the mean of its divisors is an integer number (1417320).

Almost surely, 2^9899561 is an apocalyptic number.

It is an amenable number.

9899561 is a deficient number, since it is larger than the sum of its proper divisors (1438999).

9899561 is a wasteful number, since it uses less digits than its factorization.

9899561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103.

The product of its digits is 174960, while the sum is 47.

The square root of 9899561 is about 3146.3567820576. The cubic root of 9899561 is about 214.7197430045.

The spelling of 9899561 in words is "nine million, eight hundred ninety-nine thousand, five hundred sixty-one".