9808398851 has 2 divisors, whose sum is σ = 9808398852. Its totient is φ = 9808398850.

The previous prime is 9808398841. The next prime is 9808398913. The reversal of 9808398851 is 1588938089.

It is a weak prime.

It is an emirp because it is prime and its reverse (1588938089) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9808398851 is a prime.

It is not a weakly prime, because it can be changed into another prime (9808398811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4904199425 + 4904199426.

It is an arithmetic number, because the mean of its divisors is an integer number (4904199426).

Almost surely, 2^9808398851 is an apocalyptic number.

9808398851 is a deficient number, since it is larger than the sum of its proper divisors (1).

9808398851 is an equidigital number, since it uses as much as digits as its factorization.

9808398851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 59.

The square root of 9808398851 is about 99037.3608846682. The cubic root of 9808398851 is about 2140.5861243530.

The spelling of 9808398851 in words is "nine billion, eight hundred eight million, three hundred ninety-eight thousand, eight hundred fifty-one".