228145133 has 4 divisors (see below), whose sum is σ = 228190368. Its totient is φ = 228099900.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145133 is 331541822.

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 a cyclic number.

It is not a de Polignac number, because 228145133 - 2¹⁸ = 227882989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228145096 and 228145105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228145123) 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, 13943 + ... + 25508.

It is an arithmetic number, because the mean of its divisors is an integer number (57047592).

Almost surely, 2^228145133 is an apocalyptic number.

It is an amenable number.

228145133 is a deficient number, since it is larger than the sum of its proper divisors (45235).

228145133 is an equidigital number, since it uses as much as digits as its factorization.

228145133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45234.

The product of its digits is 5760, while the sum is 29.

The square root of 228145133 is about 15104.4739398630. The cubic root of 228145133 is about 611.0410718103.

Adding to 228145133 its reverse (331541822), we get a palindrome (559686955).

The spelling of 228145133 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred thirty-three".