170218 has 4 divisors (see below), whose sum is σ = 255330. Its totient is φ = 85108.

The previous prime is 170213. The next prime is 170227. The reversal of 170218 is 812071.

170218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812071 = 13 ⋅62467.

It can be written as a sum of positive squares in only one way, i.e., 149769 + 20449 = 387^2 + 143^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 170195 and 170204.

It is not an unprimeable number, because it can be changed into a prime (170213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42553 + ... + 42556.

2¹⁷⁰²¹⁸ is an apocalyptic number.

170218 is a deficient number, since it is larger than the sum of its proper divisors (85112).

170218 is an equidigital number, since it uses as much as digits as its factorization.

170218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85111.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 170218 is about 412.5748416954. The cubic root of 170218 is about 55.4202517765.

Adding to 170218 its reverse (812071), we get a palindrome (982289).

The spelling of 170218 in words is "one hundred seventy thousand, two hundred eighteen".