228091233 has 4 divisors (see below), whose sum is σ = 304121648. Its totient is φ = 152060820.

The previous prime is 228091217. The next prime is 228091267. The reversal of 228091233 is 332190822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228091233 - 2⁴ = 228091217 is a prime.

It is a super-2 number, since 2×228091233² = 104051221142920578, which contains 22 as substring.

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 228091233.

It is not an unprimeable number, because it can be changed into a prime (228091033) 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 3 ways as a sum of consecutive naturals, for example, 38015203 + ... + 38015208.

It is an arithmetic number, because the mean of its divisors is an integer number (76030412).

Almost surely, 2^228091233 is an apocalyptic number.

It is an amenable number.

228091233 is a deficient number, since it is larger than the sum of its proper divisors (76030415).

228091233 is an equidigital number, since it uses as much as digits as its factorization.

228091233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76030414.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 228091233 is about 15102.6895949033. The cubic root of 228091233 is about 610.9929478999.

It can be divided in two parts, 22809 and 1233, that added together give a palindrome (24042).

The spelling of 228091233 in words is "two hundred twenty-eight million, ninety-one thousand, two hundred thirty-three".