99881189 has 2 divisors, whose sum is σ = 99881190. Its totient is φ = 99881188.

The previous prime is 99881179. The next prime is 99881219. The reversal of 99881189 is 98118899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99660289 + 220900 = 9983^2 + 470^2 .

It is an emirp because it is prime and its reverse (98118899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99881189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99881189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99881149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49940594 + 49940595.

It is an arithmetic number, because the mean of its divisors is an integer number (49940595).

Almost surely, 2^99881189 is an apocalyptic number.

It is an amenable number.

99881189 is a deficient number, since it is larger than the sum of its proper divisors (1).

99881189 is an equidigital number, since it uses as much as digits as its factorization.

99881189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 53.

The square root of 99881189 is about 9994.0576844443. The cubic root of 99881189 is about 463.9749865752.

The spelling of 99881189 in words is "ninety-nine million, eight hundred eighty-one thousand, one hundred eighty-nine".