228566321 has 2 divisors, whose sum is σ = 228566322. Its totient is φ = 228566320.

The previous prime is 228566297. The next prime is 228566323. The reversal of 228566321 is 123665822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203205025 + 25361296 = 14255^2 + 5036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228566321 is a prime.

Together with 228566323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228566323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114283160 + 114283161.

It is an arithmetic number, because the mean of its divisors is an integer number (114283161).

Almost surely, 2^228566321 is an apocalyptic number.

It is an amenable number.

228566321 is a deficient number, since it is larger than the sum of its proper divisors (1).

228566321 is an equidigital number, since it uses as much as digits as its factorization.

228566321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 228566321 is about 15118.4100023779. The cubic root of 228566321 is about 611.4168632339.

The spelling of 228566321 in words is "two hundred twenty-eight million, five hundred sixty-six thousand, three hundred twenty-one".