228791809 has 4 divisors (see below), whose sum is σ = 228978004. Its totient is φ = 228605616.

The previous prime is 228791807. The next prime is 228791851. The reversal of 228791809 is 908197822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194686209 + 34105600 = 13953^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 228791809 - 2¹ = 228791807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228791807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91242 + ... + 93715.

It is an arithmetic number, because the mean of its divisors is an integer number (57244501).

Almost surely, 2^228791809 is an apocalyptic number.

It is an amenable number.

228791809 is a deficient number, since it is larger than the sum of its proper divisors (186195).

228791809 is a wasteful number, since it uses less digits than its factorization.

228791809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186194.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 228791809 is about 15125.8655620100. The cubic root of 228791809 is about 611.6178579286.

The spelling of 228791809 in words is "two hundred twenty-eight million, seven hundred ninety-one thousand, eight hundred nine".