228521147 has 4 divisors (see below), whose sum is σ = 228803736. Its totient is φ = 228238560.

The previous prime is 228521129. The next prime is 228521159. The reversal of 228521147 is 741125822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 741125822 = 2 ⋅370562911.

It is a cyclic number.

It is not a de Polignac number, because 228521147 - 2¹⁴ = 228504763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228521177) 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 in 3 ways as a sum of consecutive naturals, for example, 140078 + ... + 141699.

It is an arithmetic number, because the mean of its divisors is an integer number (57200934).

Almost surely, 2^228521147 is an apocalyptic number.

228521147 is a deficient number, since it is larger than the sum of its proper divisors (282589).

228521147 is an equidigital number, since it uses as much as digits as its factorization.

228521147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282588.

The product of its digits is 8960, while the sum is 32.

The square root of 228521147 is about 15116.9159222376. The cubic root of 228521147 is about 611.3765803012.

Adding to 228521147 its reverse (741125822), we get a palindrome (969646969).

It can be divided in two parts, 2285 and 21147, that added together give a palindrome (23432).

The spelling of 228521147 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred forty-seven".