9898558981 has 2 divisors, whose sum is σ = 9898558982. Its totient is φ = 9898558980.

The previous prime is 9898558949. The next prime is 9898559017. The reversal of 9898558981 is 1898558989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8181202500 + 1717356481 = 90450^2 + 41441^2 .

It is a cyclic number.

It is not a de Polignac number, because 9898558981 - 2⁵ = 9898558949 is a prime.

It is a super-2 number, since 2×9898558981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9898558981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9898558931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949279490 + 4949279491.

It is an arithmetic number, because the mean of its divisors is an integer number (4949279491).

Almost surely, 2^9898558981 is an apocalyptic number.

It is an amenable number.

9898558981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9898558981 is an equidigital number, since it uses as much as digits as its factorization.

9898558981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74649600, while the sum is 70.

The square root of 9898558981 is about 99491.5020541956. The cubic root of 9898558981 is about 2147.1249822119.

The spelling of 9898558981 in words is "nine billion, eight hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred eighty-one".