9865243841 has 2 divisors, whose sum is σ = 9865243842. Its totient is φ = 9865243840.

The previous prime is 9865243819. The next prime is 9865243847. The reversal of 9865243841 is 1483425689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6513297025 + 3351946816 = 80705^2 + 57896^2 .

It is a cyclic number.

It is not a de Polignac number, because 9865243841 - 2¹⁴ = 9865227457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9865243841.

It is not a weakly prime, because it can be changed into another prime (9865243847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4932621920 + 4932621921.

It is an arithmetic number, because the mean of its divisors is an integer number (4932621921).

Almost surely, 2^9865243841 is an apocalyptic number.

It is an amenable number.

9865243841 is a deficient number, since it is larger than the sum of its proper divisors (1).

9865243841 is an equidigital number, since it uses as much as digits as its factorization.

9865243841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 50.

The square root of 9865243841 is about 99323.9338779934. The cubic root of 9865243841 is about 2144.7134470130.

The spelling of 9865243841 in words is "nine billion, eight hundred sixty-five million, two hundred forty-three thousand, eight hundred forty-one".