219109 has 4 divisors (see below), whose sum is σ = 239040. Its totient is φ = 199180.

The previous prime is 219103. The next prime is 219119. The reversal of 219109 is 901912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 219109 - 2¹⁷ = 88037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 219109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219103) 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, 9949 + ... + 9970.

It is an arithmetic number, because the mean of its divisors is an integer number (59760).

2²¹⁹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

219109 is a deficient number, since it is larger than the sum of its proper divisors (19931).

219109 is a wasteful number, since it uses less digits than its factorization.

219109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19930.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 219109 is about 468.0908031568. The cubic root of 219109 is about 60.2865001539.

It can be divided in two parts, 219 and 109, that multiplied together give a triangular number (23871 = T₂₁₈).

The spelling of 219109 in words is "two hundred nineteen thousand, one hundred nine".