9891841 has 4 divisors (see below), whose sum is σ = 10473732. Its totient is φ = 9309952.

The previous prime is 9891823. The next prime is 9891851. The reversal of 9891841 is 1481989.

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 4322241 + 5569600 = 2079^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891841 - 2⁵ = 9891809 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9891794 and 9891803.

It is not an unprimeable number, because it can be changed into a prime (9891851) 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, 290920 + ... + 290953.

It is an arithmetic number, because the mean of its divisors is an integer number (2618433).

It is a Proth number, since it is equal to 2415 ⋅ 2¹² + 1 and 2415 < 2¹².

Almost surely, 2^9891841 is an apocalyptic number.

It is an amenable number.

9891841 is a deficient number, since it is larger than the sum of its proper divisors (581891).

9891841 is a wasteful number, since it uses less digits than its factorization.

9891841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581890.

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

The square root of 9891841 is about 3145.1297270542. The cubic root of 9891841 is about 214.6639133404.

The spelling of 9891841 in words is "nine million, eight hundred ninety-one thousand, eight hundred forty-one".