99109 has 2 divisors, whose sum is σ = 99110. Its totient is φ = 99108.

The previous prime is 99103. The next prime is 99119. The reversal of 99109 is 90199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93025 + 6084 = 305^2 + 78^2 .

It is an emirp because it is prime and its reverse (90199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99109 - 2⁷ = 98981 is a prime.

It is a Chen prime.

99109 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49554 + 49555.

It is an arithmetic number, because the mean of its divisors is an integer number (49555).

2⁹⁹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

99109 is a deficient number, since it is larger than the sum of its proper divisors (1).

99109 is an equidigital number, since it uses as much as digits as its factorization.

99109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 99109 is about 314.8158191705. The cubic root of 99109 is about 46.2776216791.

The spelling of 99109 in words is "ninety-nine thousand, one hundred nine".