99609 has 4 divisors (see below), whose sum is σ = 132816. Its totient is φ = 66404.

The previous prime is 99607. The next prime is 99611. The reversal of 99609 is 90699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (99607) and next prime (99611).

It is a cyclic number.

It is not a de Polignac number, because 99609 - 2¹ = 99607 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 99609.

It is not an unprimeable number, because it can be changed into a prime (99607) 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 in 3 ways as a sum of consecutive naturals, for example, 16599 + ... + 16604.

It is an arithmetic number, because the mean of its divisors is an integer number (33204).

2⁹⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

99609 is a deficient number, since it is larger than the sum of its proper divisors (33207).

99609 is a wasteful number, since it uses less digits than its factorization.

99609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33206.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 99609 is about 315.6089352347. The cubic root of 99609 is about 46.3553139443.

The spelling of 99609 in words is "ninety-nine thousand, six hundred nine".