228931 has 4 divisors (see below), whose sum is σ = 241000. Its totient is φ = 216864.

The previous prime is 228929. The next prime is 228953. The reversal of 228931 is 139822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139822 = 2 ⋅69911.

It is a cyclic number.

It is not a de Polignac number, because 228931 - 2¹ = 228929 is a prime.

It is a super-2 number, since 2×228931² = 104818805522, which contains 22 as substring.

It is a Duffinian number.

228931 is a lucky number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 228896 and 228905.

It is not an unprimeable number, because it can be changed into a prime (228901) 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, 6006 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (60250).

2²²⁸⁹³¹ is an apocalyptic number.

228931 is a deficient number, since it is larger than the sum of its proper divisors (12069).

228931 is a wasteful number, since it uses less digits than its factorization.

228931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12068.

The product of its digits is 864, while the sum is 25.

The square root of 228931 is about 478.4673447582. The cubic root of 228931 is about 61.1741863596.

Multiplying 228931 by its sum of digits (25), we get a palindrome (5723275).

The spelling of 228931 in words is "two hundred twenty-eight thousand, nine hundred thirty-one".