9981100489 has 2 divisors, whose sum is σ = 9981100490. Its totient is φ = 9981100488.

The previous prime is 9981100487. The next prime is 9981100513. The reversal of 9981100489 is 9840011899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5766883600 + 4214216889 = 75940^2 + 64917^2 .

It is a cyclic number.

It is not a de Polignac number, because 9981100489 - 2¹ = 9981100487 is a prime.

Together with 9981100487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9981100487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990550244 + 4990550245.

It is an arithmetic number, because the mean of its divisors is an integer number (4990550245).

Almost surely, 2^9981100489 is an apocalyptic number.

It is an amenable number.

9981100489 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981100489 is an equidigital number, since it uses as much as digits as its factorization.

9981100489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 9981100489 is about 99905.4577538184. The cubic root of 9981100489 is about 2153.0765753447.

The spelling of 9981100489 in words is "nine billion, nine hundred eighty-one million, one hundred thousand, four hundred eighty-nine".