9998851 has 2 divisors, whose sum is σ = 9998852. Its totient is φ = 9998850.

The previous prime is 9998809. The next prime is 9998861. The reversal of 9998851 is 1588999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9998851 - 2¹¹ = 9996803 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9998795 and 9998804.

It is not a weakly prime, because it can be changed into another prime (9998801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999425 + 4999426.

It is an arithmetic number, because the mean of its divisors is an integer number (4999426).

Almost surely, 2^9998851 is an apocalyptic number.

9998851 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998851 is an equidigital number, since it uses as much as digits as its factorization.

9998851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 49.

The square root of 9998851 is about 3162.0959820980. The cubic root of 9998851 is about 215.4352172023.

The spelling of 9998851 in words is "nine million, nine hundred ninety-eight thousand, eight hundred fifty-one".