98909 has 2 divisors, whose sum is σ = 98910. Its totient is φ = 98908.

The previous prime is 98899. The next prime is 98911. The reversal of 98909 is 90989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96100 + 2809 = 310^2 + 53^2 .

It is an emirp because it is prime and its reverse (90989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98909 - 2⁴ = 98893 is a prime.

Together with 98911, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49454 + 49455.

It is an arithmetic number, because the mean of its divisors is an integer number (49455).

2⁹⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

98909 is a deficient number, since it is larger than the sum of its proper divisors (1).

98909 is an equidigital number, since it uses as much as digits as its factorization.

98909 is an evil number, because the sum of its binary digits is even.

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

The square root of 98909 is about 314.4980127123. The cubic root of 98909 is about 46.2464716081.

The spelling of 98909 in words is "ninety-eight thousand, nine hundred nine".