228981 has 8 divisors (see below), whose sum is σ = 308224. Its totient is φ = 151200.

The previous prime is 228961. The next prime is 228983. The reversal of 228981 is 189822.

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

It is not a de Polignac number, because 228981 - 2⁷ = 228853 is a prime.

It is a super-3 number, since 3×228981³ = 36018000333000423, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 228981.

It is not an unprimeable number, because it can be changed into a prime (228983) 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 7 ways as a sum of consecutive naturals, for example, 81 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (38528).

2²²⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

228981 is a deficient number, since it is larger than the sum of its proper divisors (79243).

228981 is a wasteful number, since it uses less digits than its factorization.

228981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its digits is 2304, while the sum is 30.

The square root of 228981 is about 478.5195920754. The cubic root of 228981 is about 61.1786396471.

The spelling of 228981 in words is "two hundred twenty-eight thousand, nine hundred eighty-one".