230509 has 4 divisors (see below), whose sum is σ = 231516. Its totient is φ = 229504.

The previous prime is 230507. The next prime is 230539. The reversal of 230509 is 905032.

230509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 157609 = 270^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 230509 - 2¹ = 230507 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230501) 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, 27 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (57879).

2²³⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

230509 is a deficient number, since it is larger than the sum of its proper divisors (1007).

230509 is an equidigital number, since it uses as much as digits as its factorization.

230509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 230509 is about 480.1135282410. The cubic root of 230509 is about 61.3144206285.

The spelling of 230509 in words is "two hundred thirty thousand, five hundred nine".