305686229 has 2 divisors, whose sum is σ = 305686230. Its totient is φ = 305686228.

The previous prime is 305686223. The next prime is 305686237. The reversal of 305686229 is 922686503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193961329 + 111724900 = 13927^2 + 10570^2 .

It is an emirp because it is prime and its reverse (922686503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 305686229 - 2⁸ = 305685973 is a prime.

It is a Sophie Germain 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 (305686223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152843114 + 152843115.

It is an arithmetic number, because the mean of its divisors is an integer number (152843115).

Almost surely, 2^305686229 is an apocalyptic number.

It is an amenable number.

305686229 is a deficient number, since it is larger than the sum of its proper divisors (1).

305686229 is an equidigital number, since it uses as much as digits as its factorization.

305686229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 305686229 is about 17483.8848371865. The cubic root of 305686229 is about 673.6360047991.

The spelling of 305686229 in words is "three hundred five million, six hundred eighty-six thousand, two hundred twenty-nine".