109217 has 4 divisors (see below), whose sum is σ = 110100. Its totient is φ = 108336.

The previous prime is 109211. The next prime is 109229. The reversal of 109217 is 712901.

109217 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 65536 + 43681 = 256^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 109217 - 2⁴ = 109201 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 109217.

It is not an unprimeable number, because it can be changed into a prime (109211) 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, 218 + ... + 515.

It is an arithmetic number, because the mean of its divisors is an integer number (27525).

2¹⁰⁹²¹⁷ is an apocalyptic number.

It is an amenable number.

109217 is a deficient number, since it is larger than the sum of its proper divisors (883).

109217 is an equidigital number, since it uses as much as digits as its factorization.

109217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 109217 is about 330.4799540063. The cubic root of 109217 is about 47.8002404241.

It can be divided in two parts, 109 and 217, that multiplied together give a triangular number (23653 = T₂₁₇).

The spelling of 109217 in words is "one hundred nine thousand, two hundred seventeen".