89909 has 2 divisors, whose sum is σ = 89910. Its totient is φ = 89908.

The previous prime is 89899. The next prime is 89917. The reversal of 89909 is 90998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61009 + 28900 = 247^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 89909 - 2⁸ = 89653 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44954 + 44955.

It is an arithmetic number, because the mean of its divisors is an integer number (44955).

2⁸⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

89909 is a deficient number, since it is larger than the sum of its proper divisors (1).

89909 is an equidigital number, since it uses as much as digits as its factorization.

89909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 89909 is about 299.8482949760. The cubic root of 89909 is about 44.7989383783.

Subtracting 89909 from its reverse (90998), we obtain a square (1089 = 33²).

The spelling of 89909 in words is "eighty-nine thousand, nine hundred nine".