228120133 has 4 divisors (see below), whose sum is σ = 234285580. Its totient is φ = 221954688.

The previous prime is 228120107. The next prime is 228120157. The reversal of 228120133 is 331021822.

228120133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331021822 = 2 ⋅165510911.

It can be written as a sum of positive squares in 2 ways, for example, as 206152164 + 21967969 = 14358^2 + 4687^2 .

It is a cyclic number.

It is not a de Polignac number, because 228120133 - 2¹⁷ = 227989061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228120173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3082668 + ... + 3082741.

It is an arithmetic number, because the mean of its divisors is an integer number (58571395).

Almost surely, 2^228120133 is an apocalyptic number.

It is an amenable number.

228120133 is a deficient number, since it is larger than the sum of its proper divisors (6165447).

228120133 is an equidigital number, since it uses as much as digits as its factorization.

228120133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165446.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 228120133 is about 15103.6463478195. The cubic root of 228120133 is about 611.0187518297.

Adding to 228120133 its reverse (331021822), we get a palindrome (559141955).

The spelling of 228120133 in words is "two hundred twenty-eight million, one hundred twenty thousand, one hundred thirty-three".