99911998189 has 2 divisors, whose sum is σ = 99911998190. Its totient is φ = 99911998188.

The previous prime is 99911998181. The next prime is 99911998217. The reversal of 99911998189 is 98189911999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92054594025 + 7857404164 = 303405^2 + 88642^2 .

It is a cyclic number.

It is not a de Polignac number, because 99911998189 - 2³ = 99911998181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99911998181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49955999094 + 49955999095.

It is an arithmetic number, because the mean of its divisors is an integer number (49955999095).

Almost surely, 2^99911998189 is an apocalyptic number.

It is an amenable number.

99911998189 is a deficient number, since it is larger than the sum of its proper divisors (1).

99911998189 is an equidigital number, since it uses as much as digits as its factorization.

99911998189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34012224, while the sum is 73.

The spelling of 99911998189 in words is "ninety-nine billion, nine hundred eleven million, nine hundred ninety-eight thousand, one hundred eighty-nine".