9981841 has 4 divisors (see below), whose sum is σ = 9990000. Its totient is φ = 9973684.

The previous prime is 9981809. The next prime is 9981847. The reversal of 9981841 is 1481899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9981841 - 2⁵ = 9981809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9981794 and 9981803.

It is not an unprimeable number, because it can be changed into a prime (9981847) 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 3 ways as a sum of consecutive naturals, for example, 1831 + ... + 4828.

It is an arithmetic number, because the mean of its divisors is an integer number (2497500).

Almost surely, 2^9981841 is an apocalyptic number.

It is an amenable number.

9981841 is a deficient number, since it is larger than the sum of its proper divisors (8159).

9981841 is a wasteful number, since it uses less digits than its factorization.

9981841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158.

The product of its digits is 20736, while the sum is 40.

The square root of 9981841 is about 3159.4051655335. The cubic root of 9981841 is about 215.3129820557.

The spelling of 9981841 in words is "nine million, nine hundred eighty-one thousand, eight hundred forty-one".