228695309 has 2 divisors, whose sum is σ = 228695310. Its totient is φ = 228695308.

The previous prime is 228695287. The next prime is 228695353. The reversal of 228695309 is 903596822.

228695309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (228695353) can be obtained adding 228695309 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226592809 + 2102500 = 15053^2 + 1450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228695309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228695309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228695359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114347654 + 114347655.

It is an arithmetic number, because the mean of its divisors is an integer number (114347655).

Almost surely, 2^228695309 is an apocalyptic number.

It is an amenable number.

228695309 is a deficient number, since it is larger than the sum of its proper divisors (1).

228695309 is an equidigital number, since it uses as much as digits as its factorization.

228695309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 228695309 is about 15122.6753254839. The cubic root of 228695309 is about 611.5318562728.

The spelling of 228695309 in words is "two hundred twenty-eight million, six hundred ninety-five thousand, three hundred nine".