228561 has 8 divisors (see below), whose sum is σ = 311424. Its totient is φ = 149040.

The previous prime is 228559. The next prime is 228577. The reversal of 228561 is 165822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228561 - 2¹ = 228559 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (228511) 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 7 ways as a sum of consecutive naturals, for example, 670 + ... + 951.

It is an arithmetic number, because the mean of its divisors is an integer number (38928).

2²²⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

228561 is a deficient number, since it is larger than the sum of its proper divisors (82863).

228561 is a wasteful number, since it uses less digits than its factorization.

228561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671.

The product of its digits is 960, while the sum is 24.

The square root of 228561 is about 478.0805371483. The cubic root of 228561 is about 61.1412118624.

It can be divided in two parts, 2285 and 61, that added together give a triangular number (2346 = T₆₈).

The spelling of 228561 in words is "two hundred twenty-eight thousand, five hundred sixty-one".