815348909 has 4 divisors (see below), whose sum is σ = 837385404. Its totient is φ = 793312416.

The previous prime is 815348893. The next prime is 815348939. The reversal of 815348909 is 909843518.

815348909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 782320900 + 33028009 = 27970^2 + 5747^2 .

It is a cyclic number.

It is not a de Polignac number, because 815348909 - 2⁴ = 815348893 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 (815348939) 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, 11018192 + ... + 11018265.

It is an arithmetic number, because the mean of its divisors is an integer number (209346351).

Almost surely, 2^815348909 is an apocalyptic number.

It is an amenable number.

815348909 is a deficient number, since it is larger than the sum of its proper divisors (22036495).

815348909 is a wasteful number, since it uses less digits than its factorization.

815348909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22036494.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 815348909 is about 28554.3150679543. The cubic root of 815348909 is about 934.2171410429.

The spelling of 815348909 in words is "eight hundred fifteen million, three hundred forty-eight thousand, nine hundred nine".