9988236481 has 2 divisors, whose sum is σ = 9988236482. Its totient is φ = 9988236480.

The previous prime is 9988236397. The next prime is 9988236493. The reversal of 9988236481 is 1846328899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9928328881 + 59907600 = 99641^2 + 7740^2 .

It is a cyclic number.

It is not a de Polignac number, because 9988236481 - 2¹⁷ = 9988105409 is a prime.

It is a super-2 number, since 2×9988236481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9988236281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994118240 + 4994118241.

It is an arithmetic number, because the mean of its divisors is an integer number (4994118241).

Almost surely, 2^9988236481 is an apocalyptic number.

It is an amenable number.

9988236481 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988236481 is an equidigital number, since it uses as much as digits as its factorization.

9988236481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 58.

The square root of 9988236481 is about 99941.1650972711. The cubic root of 9988236481 is about 2153.5895674443.

The spelling of 9988236481 in words is "nine billion, nine hundred eighty-eight million, two hundred thirty-six thousand, four hundred eighty-one".