99817217 has 16 divisors (see below), whose sum is σ = 114099840. Its totient is φ = 86752512.

The previous prime is 99817187. The next prime is 99817243. The reversal of 99817217 is 71271899.

It is a cyclic number.

It is not a de Polignac number, because 99817217 - 2¹⁰ = 99816193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99817517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6938 + ... + 15740.

It is an arithmetic number, because the mean of its divisors is an integer number (7131240).

Almost surely, 2^99817217 is an apocalyptic number.

It is an amenable number.

99817217 is a deficient number, since it is larger than the sum of its proper divisors (14282623).

99817217 is a wasteful number, since it uses less digits than its factorization.

99817217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872.

The product of its digits is 63504, while the sum is 44.

The square root of 99817217 is about 9990.8566699758. The cubic root of 99817217 is about 463.8759097047.

The spelling of 99817217 in words is "ninety-nine million, eight hundred seventeen thousand, two hundred seventeen".