228491 has 4 divisors (see below), whose sum is σ = 236400. Its totient is φ = 220584.

The previous prime is 228479. The next prime is 228509. The reversal of 228491 is 194822.

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

It is a cyclic number.

It is not a de Polignac number, because 228491 - 2⁶ = 228427 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 228491.

It is not an unprimeable number, because it can be changed into a prime (228421) 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, 3911 + ... + 3968.

It is an arithmetic number, because the mean of its divisors is an integer number (59100).

2²²⁸⁴⁹¹ is an apocalyptic number.

228491 is a deficient number, since it is larger than the sum of its proper divisors (7909).

228491 is an equidigital number, since it uses as much as digits as its factorization.

228491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908.

The product of its digits is 1152, while the sum is 26.

The square root of 228491 is about 478.0073221197. The cubic root of 228491 is about 61.1349694415.

The spelling of 228491 in words is "two hundred twenty-eight thousand, four hundred ninety-one".