99985609 has 4 divisors (see below), whose sum is σ = 100057104. Its totient is φ = 99914116.

The previous prime is 99985603. The next prime is 99985637. The reversal of 99985609 is 90658999.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90658999 = 2221 ⋅40819.

It is a cyclic number.

It is not a de Polignac number, because 99985609 - 2¹³ = 99977417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99985609.

It is not an unprimeable number, because it can be changed into a prime (99985603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33607 + ... + 36460.

It is an arithmetic number, because the mean of its divisors is an integer number (25014276).

Almost surely, 2^99985609 is an apocalyptic number.

It is an amenable number.

99985609 is a deficient number, since it is larger than the sum of its proper divisors (71495).

99985609 is a wasteful number, since it uses less digits than its factorization.

99985609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71494.

The product of its (nonzero) digits is 1574640, while the sum is 55.

The square root of 99985609 is about 9999.2804241105. The cubic root of 99985609 is about 464.1366165915.

The spelling of 99985609 in words is "ninety-nine million, nine hundred eighty-five thousand, six hundred nine".