228791 has 4 divisors (see below), whose sum is σ = 231000. Its totient is φ = 226584.

The previous prime is 228773. The next prime is 228793. The reversal of 228791 is 197822.

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: 197822 = 2 ⋅98911.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941 + ... + 1158.

It is an arithmetic number, because the mean of its divisors is an integer number (57750).

2²²⁸⁷⁹¹ is an apocalyptic number.

228791 is a deficient number, since it is larger than the sum of its proper divisors (2209).

228791 is a wasteful number, since it uses less digits than its factorization.

228791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208.

The product of its digits is 2016, while the sum is 29.

The square root of 228791 is about 478.3210219089. The cubic root of 228791 is about 61.1617137041.

The spelling of 228791 in words is "two hundred twenty-eight thousand, seven hundred ninety-one".