9982991 has 4 divisors (see below), whose sum is σ = 10103352. Its totient is φ = 9862632.

The previous prime is 9982981. The next prime is 9983011. The reversal of 9982991 is 1992899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1992899 = 71 ⋅28069.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9982991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9982901) 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, 60056 + ... + 60221.

It is an arithmetic number, because the mean of its divisors is an integer number (2525838).

Almost surely, 2^9982991 is an apocalyptic number.

9982991 is a deficient number, since it is larger than the sum of its proper divisors (120361).

9982991 is a wasteful number, since it uses less digits than its factorization.

9982991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120360.

The product of its digits is 104976, while the sum is 47.

The square root of 9982991 is about 3159.5871565760. The cubic root of 9982991 is about 215.3212504176.

The spelling of 9982991 in words is "nine million, nine hundred eighty-two thousand, nine hundred ninety-one".