228705317 has 2 divisors, whose sum is σ = 228705318. Its totient is φ = 228705316.

The previous prime is 228705293. The next prime is 228705329. The reversal of 228705317 is 713507822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170198116 + 58507201 = 13046^2 + 7649^2 .

It is a cyclic number.

It is not a de Polignac number, because 228705317 - 2²² = 224511013 is a prime.

It is a super-2 number, since 2×228705317² = 104612244048140978, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228705517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114352658 + 114352659.

It is an arithmetic number, because the mean of its divisors is an integer number (114352659).

Almost surely, 2^228705317 is an apocalyptic number.

It is an amenable number.

228705317 is a deficient number, since it is larger than the sum of its proper divisors (1).

228705317 is an equidigital number, since it uses as much as digits as its factorization.

228705317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 228705317 is about 15123.0062156967. The cubic root of 228705317 is about 611.5407766154.

The spelling of 228705317 in words is "two hundred twenty-eight million, seven hundred five thousand, three hundred seventeen".