228518233 has 4 divisors (see below), whose sum is σ = 241960500. Its totient is φ = 215075968.

The previous prime is 228518209. The next prime is 228518237. The reversal of 228518233 is 332815822.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189117504 + 39400729 = 13752^2 + 6277^2 .

It is a cyclic number.

It is not a de Polignac number, because 228518233 - 2⁵ = 228518201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228518237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6721108 + ... + 6721141.

It is an arithmetic number, because the mean of its divisors is an integer number (60490125).

Almost surely, 2^228518233 is an apocalyptic number.

It is an amenable number.

228518233 is a deficient number, since it is larger than the sum of its proper divisors (13442267).

228518233 is a wasteful number, since it uses less digits than its factorization.

228518233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13442266.

The product of its digits is 23040, while the sum is 34.

The square root of 228518233 is about 15116.8195398371. The cubic root of 228518233 is about 611.3739816228.

The spelling of 228518233 in words is "two hundred twenty-eight million, five hundred eighteen thousand, two hundred thirty-three".