99217009 has 4 divisors (see below), whose sum is σ = 103530816. Its totient is φ = 94903204.

The previous prime is 99217003. The next prime is 99217021. The reversal of 99217009 is 90071299.

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: 90071299 = 1429 ⋅63031.

It is a cyclic number.

It is not a de Polignac number, because 99217009 - 2⁵ = 99216977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99217003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2156869 + ... + 2156914.

It is an arithmetic number, because the mean of its divisors is an integer number (25882704).

Almost surely, 2^99217009 is an apocalyptic number.

It is an amenable number.

99217009 is a deficient number, since it is larger than the sum of its proper divisors (4313807).

99217009 is a wasteful number, since it uses less digits than its factorization.

99217009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313806.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 99217009 is about 9960.7735141404. The cubic root of 99217009 is about 462.9442669504.

The spelling of 99217009 in words is "ninety-nine million, two hundred seventeen thousand, nine".