217143 has 12 divisors (see below), whose sum is σ = 327600. Its totient is φ = 138336.

The previous prime is 217121. The next prime is 217157. The reversal of 217143 is 341712.

217143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217143 - 2⁵ = 217111 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (27300).

2²¹⁷¹⁴³ is an apocalyptic number.

217143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

217143 is a deficient number, since it is larger than the sum of its proper divisors (110457).

217143 is a wasteful number, since it uses less digits than its factorization.

217143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078 (or 1075 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 217143 is about 465.9860512934. The cubic root of 217143 is about 60.1056472020.

Adding to 217143 its reverse (341712), we get a palindrome (558855).

The spelling of 217143 in words is "two hundred seventeen thousand, one hundred forty-three", and thus it is an iban number.