385815109 has 4 divisors (see below), whose sum is σ = 389229516. Its totient is φ = 382400704.

The previous prime is 385815107. The next prime is 385815113. The reversal of 385815109 is 901518583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114554209 + 271260900 = 10703^2 + 16470^2 .

It is a cyclic number.

It is not a de Polignac number, because 385815109 - 2¹ = 385815107 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 (385815103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707034 + ... + 1707259.

It is an arithmetic number, because the mean of its divisors is an integer number (97307379).

Almost surely, 2^385815109 is an apocalyptic number.

It is an amenable number.

385815109 is a deficient number, since it is larger than the sum of its proper divisors (3414407).

385815109 is a wasteful number, since it uses less digits than its factorization.

385815109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414406.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 385815109 is about 19642.1767887370. The cubic root of 385815109 is about 727.9916707224.

The spelling of 385815109 in words is "three hundred eighty-five million, eight hundred fifteen thousand, one hundred nine".