385528109 has 4 divisors (see below), whose sum is σ = 386744604. Its totient is φ = 384311616.

The previous prime is 385528081. The next prime is 385528127. The reversal of 385528109 is 901825583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901825583 = 751 ⋅1200833.

It can be written as a sum of positive squares in 2 ways, for example, as 111724900 + 273803209 = 10570^2 + 16547^2 .

It is a cyclic number.

It is not a de Polignac number, because 385528109 - 2²⁸ = 117092653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385528189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607772 + ... + 608405.

It is an arithmetic number, because the mean of its divisors is an integer number (96686151).

Almost surely, 2^385528109 is an apocalyptic number.

It is an amenable number.

385528109 is a deficient number, since it is larger than the sum of its proper divisors (1216495).

385528109 is a wasteful number, since it uses less digits than its factorization.

385528109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216494.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 385528109 is about 19634.8697220022. The cubic root of 385528109 is about 727.8111132195.

The spelling of 385528109 in words is "three hundred eighty-five million, five hundred twenty-eight thousand, one hundred nine".