230505809 has 4 divisors (see below), whose sum is σ = 230598720. Its totient is φ = 230412900.

The previous prime is 230505799. The next prime is 230505859. The reversal of 230505809 is 908505032.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230505809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (230505859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42629 + ... + 47730.

It is an arithmetic number, because the mean of its divisors is an integer number (57649680).

Almost surely, 2^230505809 is an apocalyptic number.

It is an amenable number.

230505809 is a deficient number, since it is larger than the sum of its proper divisors (92911).

230505809 is an equidigital number, since it uses as much as digits as its factorization.

230505809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92910.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 230505809 is about 15182.4177587102. The cubic root of 230505809 is about 613.1413769632.

The spelling of 230505809 in words is "two hundred thirty million, five hundred five thousand, eight hundred nine".