228384521 has 2 divisors, whose sum is σ = 228384522. Its totient is φ = 228384520.

The previous prime is 228384517. The next prime is 228384523. The reversal of 228384521 is 125483822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227406400 + 978121 = 15080^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 228384521 - 2² = 228384517 is a prime.

It is a Sophie Germain prime.

Together with 228384523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (228384523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114192260 + 114192261.

It is an arithmetic number, because the mean of its divisors is an integer number (114192261).

Almost surely, 2^228384521 is an apocalyptic number.

It is an amenable number.

228384521 is a deficient number, since it is larger than the sum of its proper divisors (1).

228384521 is an equidigital number, since it uses as much as digits as its factorization.

228384521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 35.

The square root of 228384521 is about 15112.3962692883. The cubic root of 228384521 is about 611.2547147175.

The spelling of 228384521 in words is "two hundred twenty-eight million, three hundred eighty-four thousand, five hundred twenty-one".