228145173 has 4 divisors (see below), whose sum is σ = 304193568. Its totient is φ = 152096780.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145173 is 371541822.

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 228145173 - 2¹² = 228141077 is a prime.

It is a Curzon number.

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 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, 38024193 + ... + 38024198.

It is an arithmetic number, because the mean of its divisors is an integer number (76048392).

Almost surely, 2^228145173 is an apocalyptic number.

It is an amenable number.

228145173 is a deficient number, since it is larger than the sum of its proper divisors (76048395).

228145173 is an equidigital number, since it uses as much as digits as its factorization.

228145173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76048394.

The product of its digits is 13440, while the sum is 33.

The square root of 228145173 is about 15104.4752639739. The cubic root of 228145173 is about 611.0411075209.

Adding to 228145173 its reverse (371541822), we get a palindrome (599686995).

The spelling of 228145173 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred seventy-three".