9981656 has 16 divisors (see below), whose sum is σ = 18758040. Its totient is φ = 4979520.

The previous prime is 9981637. The next prime is 9981661. The reversal of 9981656 is 6561899.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3236 + ... + 5516.

Almost surely, 2^9981656 is an apocalyptic number.

It is an amenable number.

9981656 is a deficient number, since it is larger than the sum of its proper divisors (8776384).

9981656 is a wasteful number, since it uses less digits than its factorization.

9981656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834 (or 2830 counting only the distinct ones).

The product of its digits is 116640, while the sum is 44.

The square root of 9981656 is about 3159.3758877348. The cubic root of 9981656 is about 215.3116518687.

The spelling of 9981656 in words is "nine million, nine hundred eighty-one thousand, six hundred fifty-six".