9842561 has 2 divisors, whose sum is σ = 9842562. Its totient is φ = 9842560.

The previous prime is 9842527. The next prime is 9842563. The reversal of 9842561 is 1652489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7182400 + 2660161 = 2680^2 + 1631^2 .

It is an emirp because it is prime and its reverse (1652489) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9842561 - 2¹⁰ = 9841537 is a prime.

It is a Sophie Germain prime.

Together with 9842563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9842563) 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, 4921280 + 4921281.

It is an arithmetic number, because the mean of its divisors is an integer number (4921281).

Almost surely, 2^9842561 is an apocalyptic number.

It is an amenable number.

9842561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9842561 is an equidigital number, since it uses as much as digits as its factorization.

9842561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 9842561 is about 3137.2856102051. The cubic root of 9842561 is about 214.3068428479.

The spelling of 9842561 in words is "nine million, eight hundred forty-two thousand, five hundred sixty-one".