228508909 has 4 divisors (see below), whose sum is σ = 228856320. Its totient is φ = 228161500.

The previous prime is 228508853. The next prime is 228508913. The reversal of 228508909 is 909805822.

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 228508909 - 2¹³ = 228500717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228508999) 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, 172717 + ... + 174034.

It is an arithmetic number, because the mean of its divisors is an integer number (57214080).

Almost surely, 2^228508909 is an apocalyptic number.

It is an amenable number.

228508909 is a deficient number, since it is larger than the sum of its proper divisors (347411).

228508909 is an equidigital number, since it uses as much as digits as its factorization.

228508909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347410.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 228508909 is about 15116.5111384869. The cubic root of 228508909 is about 611.3656664168.

The spelling of 228508909 in words is "two hundred twenty-eight million, five hundred eight thousand, nine hundred nine".