243217 has 8 divisors (see below), whose sum is σ = 267624. Its totient is φ = 219648.

The previous prime is 243209. The next prime is 243227. The reversal of 243217 is 712342.

243217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 16641 + 226576 = 129^2 + 476^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243217 - 2³ = 243209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243194 and 243203.

It is not an unprimeable number, because it can be changed into a prime (243227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513 + ... + 865.

It is an arithmetic number, because the mean of its divisors is an integer number (33453).

2²⁴³²¹⁷ is an apocalyptic number.

It is an amenable number.

243217 is a deficient number, since it is larger than the sum of its proper divisors (24407).

243217 is a wasteful number, since it uses less digits than its factorization.

243217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its digits is 336, while the sum is 19.

The square root of 243217 is about 493.1703559623. The cubic root of 243217 is about 62.4210843992.

Adding to 243217 its reverse (712342), we get a palindrome (955559).

The spelling of 243217 in words is "two hundred forty-three thousand, two hundred seventeen", and thus it is an iban number.