224509 has 4 divisors (see below), whose sum is σ = 225504. Its totient is φ = 223516.

The previous prime is 224501. The next prime is 224513. The reversal of 224509 is 905422.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 224509 - 2³ = 224501 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 224509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24 + ... + 670.

It is an arithmetic number, because the mean of its divisors is an integer number (56376).

2²²⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

224509 is a deficient number, since it is larger than the sum of its proper divisors (995).

224509 is an equidigital number, since it uses as much as digits as its factorization.

224509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 224509 is about 473.8238069156. The cubic root of 224509 is about 60.7777453466. Note that the first 4 decimals are identical.

The spelling of 224509 in words is "two hundred twenty-four thousand, five hundred nine".