99442209 has 4 divisors (see below), whose sum is σ = 132589616. Its totient is φ = 66294804.

The previous prime is 99442207. The next prime is 99442229. The reversal of 99442209 is 90224499.

99442209 is nontrivially palindromic in base 14.

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: 90224499 = 3 ⋅30074833.

It is not a de Polignac number, because 99442209 - 2¹ = 99442207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99442201) 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, 16573699 + ... + 16573704.

It is an arithmetic number, because the mean of its divisors is an integer number (33147404).

Almost surely, 2^99442209 is an apocalyptic number.

It is an amenable number.

99442209 is a deficient number, since it is larger than the sum of its proper divisors (33147407).

99442209 is a wasteful number, since it uses less digits than its factorization.

99442209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33147406.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 99442209 is about 9972.0714498042. The cubic root of 99442209 is about 463.2942616099.

The spelling of 99442209 in words is "ninety-nine million, four hundred forty-two thousand, two hundred nine".