228305321 has 2 divisors, whose sum is σ = 228305322. Its totient is φ = 228305320.

The previous prime is 228305317. The next prime is 228305323. The reversal of 228305321 is 123503822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223084096 + 5221225 = 14936^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 228305321 - 2² = 228305317 is a prime.

It is a Sophie Germain prime.

Together with 228305323, 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 (228305323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114152660 + 114152661.

It is an arithmetic number, because the mean of its divisors is an integer number (114152661).

Almost surely, 2^228305321 is an apocalyptic number.

It is an amenable number.

228305321 is a deficient number, since it is larger than the sum of its proper divisors (1).

228305321 is an equidigital number, since it uses as much as digits as its factorization.

228305321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 228305321 is about 15109.7756766935. The cubic root of 228305321 is about 611.1840488505.

The spelling of 228305321 in words is "two hundred twenty-eight million, three hundred five thousand, three hundred twenty-one".