9901841 has 2 divisors, whose sum is σ = 9901842. Its totient is φ = 9901840.

The previous prime is 9901823. The next prime is 9901867. The reversal of 9901841 is 1481099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 10816 = 3145^2 + 104^2 .

It is an emirp because it is prime and its reverse (1481099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9901841 - 2⁶ = 9901777 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₆₅₈₅₆₂ and since 9901841 and 658562 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 9901798 and 9901807.

It is not a weakly prime, because it can be changed into another prime (9901141) 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 as a sum of consecutive naturals, namely, 4950920 + 4950921.

It is an arithmetic number, because the mean of its divisors is an integer number (4950921).

Almost surely, 2^9901841 is an apocalyptic number.

It is an amenable number.

9901841 is a deficient number, since it is larger than the sum of its proper divisors (1).

9901841 is an equidigital number, since it uses as much as digits as its factorization.

9901841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 9901841 is about 3146.7190850154. The cubic root of 9901841 is about 214.7362260059.

The spelling of 9901841 in words is "nine million, nine hundred one thousand, eight hundred forty-one".