228335309 has 2 divisors, whose sum is σ = 228335310. Its totient is φ = 228335308.

The previous prime is 228335291. The next prime is 228335311. The reversal of 228335309 is 903533822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189833284 + 38502025 = 13778^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 228335309 - 2²⁰ = 227286733 is a prime.

It is a super-2 number, since 2×228335309² = 104274026672250962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 228335311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228335389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114167654 + 114167655.

It is an arithmetic number, because the mean of its divisors is an integer number (114167655).

Almost surely, 2^228335309 is an apocalyptic number.

It is an amenable number.

228335309 is a deficient number, since it is larger than the sum of its proper divisors (1).

228335309 is an equidigital number, since it uses as much as digits as its factorization.

228335309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 228335309 is about 15110.7679818069. The cubic root of 228335309 is about 611.2108074396.

The spelling of 228335309 in words is "two hundred twenty-eight million, three hundred thirty-five thousand, three hundred nine".