228308321 has 2 divisors, whose sum is σ = 228308322. Its totient is φ = 228308320.

The previous prime is 228308309. The next prime is 228308357. The reversal of 228308321 is 123803822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142468096 + 85840225 = 11936^2 + 9265^2 .

It is a cyclic number.

It is not a de Polignac number, because 228308321 - 2¹⁴ = 228291937 is a prime.

It is a Chen prime.

It is equal to p_12554642 and since 228308321 and 12554642 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (228305321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114154160 + 114154161.

It is an arithmetic number, because the mean of its divisors is an integer number (114154161).

Almost surely, 2^228308321 is an apocalyptic number.

It is an amenable number.

228308321 is a deficient number, since it is larger than the sum of its proper divisors (1).

228308321 is an equidigital number, since it uses as much as digits as its factorization.

228308321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 228308321 is about 15109.8749498465. The cubic root of 228308321 is about 611.1867258857.

The spelling of 228308321 in words is "two hundred twenty-eight million, three hundred eight thousand, three hundred twenty-one".