385217109 has 12 divisors (see below), whose sum is σ = 556661196. Its totient is φ = 256702272.

The previous prime is 385217089. The next prime is 385217111. The reversal of 385217109 is 901712583.

It can be written as a sum of positive squares in 2 ways, for example, as 198894609 + 186322500 = 14103^2 + 13650^2 .

It is not a de Polignac number, because 385217109 - 2¹⁵ = 385184341 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385217309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17287 + ... + 32699.

It is an arithmetic number, because the mean of its divisors is an integer number (46388433).

Almost surely, 2^385217109 is an apocalyptic number.

It is an amenable number.

385217109 is a deficient number, since it is larger than the sum of its proper divisors (171444087).

385217109 is a wasteful number, since it uses less digits than its factorization.

385217109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18196 (or 18193 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 385217109 is about 19626.9485402087. The cubic root of 385217109 is about 727.6153556405.

The spelling of 385217109 in words is "three hundred eighty-five million, two hundred seventeen thousand, one hundred nine".