228985289 has 4 divisors (see below), whose sum is σ = 246599556. Its totient is φ = 211371024.

The previous prime is 228985279. The next prime is 228985301. The reversal of 228985289 is 982589822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982589822 = 2 ⋅491294911.

It can be written as a sum of positive squares in 2 ways, for example, as 21855625 + 207129664 = 4675^2 + 14392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228985289 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 228985289.

It is not an unprimeable number, because it can be changed into a prime (228985219) 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, 8807114 + ... + 8807139.

It is an arithmetic number, because the mean of its divisors is an integer number (61649889).

Almost surely, 2^228985289 is an apocalyptic number.

It is an amenable number.

228985289 is a deficient number, since it is larger than the sum of its proper divisors (17614267).

228985289 is a wasteful number, since it uses less digits than its factorization.

228985289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17614266.

The product of its digits is 1658880, while the sum is 53.

The square root of 228985289 is about 15132.2598774935. The cubic root of 228985289 is about 611.7902161991.

It can be divided in two parts, 2289 and 85289, that added together give a palindrome (87578).

The spelling of 228985289 in words is "two hundred twenty-eight million, nine hundred eighty-five thousand, two hundred eighty-nine".