9998424749 has 2 divisors, whose sum is σ = 9998424750. Its totient is φ = 9998424748.

The previous prime is 9998424731. The next prime is 9998424763. The reversal of 9998424749 is 9474248999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9548221225 + 450203524 = 97715^2 + 21218^2 .

It is an emirp because it is prime and its reverse (9474248999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998424749 is a prime.

It is a super-2 number, since 2×9998424749² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998421749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999212374 + 4999212375.

It is an arithmetic number, because the mean of its divisors is an integer number (4999212375).

Almost surely, 2^9998424749 is an apocalyptic number.

It is an amenable number.

9998424749 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998424749 is an equidigital number, since it uses as much as digits as its factorization.

9998424749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 65.

The square root of 9998424749 is about 99992.1234347986. The cubic root of 9998424749 is about 2154.3215582446.

The spelling of 9998424749 in words is "nine billion, nine hundred ninety-eight million, four hundred twenty-four thousand, seven hundred forty-nine".