99997217 has 4 divisors (see below), whose sum is σ = 100017300. Its totient is φ = 99977136.

The previous prime is 99997189. The next prime is 99997243. The reversal of 99997217 is 71279999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 61606801 = 6196^2 + 7849^2 .

It is a cyclic number.

It is not a de Polignac number, because 99997217 - 2¹⁴ = 99980833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99997267) 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, 3659 + ... + 14607.

It is an arithmetic number, because the mean of its divisors is an integer number (25004325).

Almost surely, 2^99997217 is an apocalyptic number.

It is an amenable number.

99997217 is a deficient number, since it is larger than the sum of its proper divisors (20083).

99997217 is a wasteful number, since it uses less digits than its factorization.

99997217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20082.

The product of its digits is 642978, while the sum is 53.

The square root of 99997217 is about 9999.8608490319. The cubic root of 99997217 is about 464.1545774741.

The spelling of 99997217 in words is "ninety-nine million, nine hundred ninety-seven thousand, two hundred seventeen".