9894804817 has 2 divisors, whose sum is σ = 9894804818. Its totient is φ = 9894804816.

The previous prime is 9894804779. The next prime is 9894804827. The reversal of 9894804817 is 7184084989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7638934801 + 2255870016 = 87401^2 + 47496^2 .

It is an emirp because it is prime and its reverse (7184084989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9894804817 - 2¹¹ = 9894802769 is a prime.

It is not a weakly prime, because it can be changed into another prime (9894804827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4947402408 + 4947402409.

It is an arithmetic number, because the mean of its divisors is an integer number (4947402409).

Almost surely, 2^9894804817 is an apocalyptic number.

It is an amenable number.

9894804817 is a deficient number, since it is larger than the sum of its proper divisors (1).

9894804817 is an equidigital number, since it uses as much as digits as its factorization.

9894804817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 58.

The square root of 9894804817 is about 99472.6335079151. The cubic root of 9894804817 is about 2146.8535057077.

The spelling of 9894804817 in words is "nine billion, eight hundred ninety-four million, eight hundred four thousand, eight hundred seventeen".