228423133 has 2 divisors, whose sum is σ = 228423134. Its totient is φ = 228423132.

The previous prime is 228423131. The next prime is 228423191. The reversal of 228423133 is 331324822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213072409 + 15350724 = 14597^2 + 3918^2 .

It is a cyclic number.

It is not a de Polignac number, because 228423133 - 2¹ = 228423131 is a prime.

It is a super-3 number, since 3×228423133³ (a number of 26 digits) contains 333 as substring.

Together with 228423131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228423131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114211566 + 114211567.

It is an arithmetic number, because the mean of its divisors is an integer number (114211567).

Almost surely, 2^228423133 is an apocalyptic number.

It is an amenable number.

228423133 is a deficient number, since it is larger than the sum of its proper divisors (1).

228423133 is an equidigital number, since it uses as much as digits as its factorization.

228423133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

The square root of 228423133 is about 15113.6737095916. The cubic root of 228423133 is about 611.2891601884.

Adding to 228423133 its reverse (331324822), we get a palindrome (559747955).

The spelling of 228423133 in words is "two hundred twenty-eight million, four hundred twenty-three thousand, one hundred thirty-three".