99217 has 4 divisors (see below), whose sum is σ = 101376. Its totient is φ = 97060.

The previous prime is 99191. The next prime is 99223. The reversal of 99217 is 71299.

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 a cyclic number.

It is not a de Polignac number, because 99217 - 2⁷ = 99089 is a prime.

It is a Duffinian number.

99217 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (99257) 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, 1009 + ... + 1102.

It is an arithmetic number, because the mean of its divisors is an integer number (25344).

2⁹⁹²¹⁷ is an apocalyptic number.

It is an amenable number.

99217 is a deficient number, since it is larger than the sum of its proper divisors (2159).

99217 is a wasteful number, since it uses less digits than its factorization.

99217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158.

The product of its digits is 1134, while the sum is 28.

The square root of 99217 is about 314.9873013313. The cubic root of 99217 is about 46.2944252953.

The spelling of 99217 in words is "ninety-nine thousand, two hundred seventeen".