228169 has 4 divisors (see below), whose sum is σ = 229140. Its totient is φ = 227200.

The previous prime is 228139. The next prime is 228181. The reversal of 228169 is 961822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 961822 = 2 ⋅480911.

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 78400 = 387^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 228169 - 2¹³ = 219977 is a prime.

It is a super-2 number, since 2×228169² = 104122185122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228139) 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, 117 + ... + 685.

It is an arithmetic number, because the mean of its divisors is an integer number (57285).

2²²⁸¹⁶⁹ is an apocalyptic number.

It is an amenable number.

228169 is a deficient number, since it is larger than the sum of its proper divisors (971).

228169 is an equidigital number, since it uses as much as digits as its factorization.

228169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

The product of its digits is 1728, while the sum is 28.

The square root of 228169 is about 477.6703884479. The cubic root of 228169 is about 61.1062378728.

The spelling of 228169 in words is "two hundred twenty-eight thousand, one hundred sixty-nine".