209143 has 4 divisors (see below), whose sum is σ = 228168. Its totient is φ = 190120.

The previous prime is 209123. The next prime is 209147. The reversal of 209143 is 341902.

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

It is a cyclic number.

It is not a de Polignac number, because 209143 - 2⁹ = 208631 is a prime.

It is an Ulam number.

It is a Duffinian number.

209143 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 209143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9496 + ... + 9517.

It is an arithmetic number, because the mean of its divisors is an integer number (57042).

2²⁰⁹¹⁴³ is an apocalyptic number.

209143 is a deficient number, since it is larger than the sum of its proper divisors (19025).

209143 is a wasteful number, since it uses less digits than its factorization.

209143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19024.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 209143 is about 457.3215498968. The cubic root of 209143 is about 59.3582530793.

The spelling of 209143 in words is "two hundred nine thousand, one hundred forty-three".