855799509 has 16 divisors (see below), whose sum is σ = 1166466560. Its totient is φ = 557956080.

The previous prime is 855799493. The next prime is 855799517. The reversal of 855799509 is 905997558.

855799509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 855799509 - 2⁴ = 855799493 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 (855799409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12624 + ... + 43254.

It is an arithmetic number, because the mean of its divisors is an integer number (72904160).

Almost surely, 2^855799509 is an apocalyptic number.

It is an amenable number.

855799509 is a deficient number, since it is larger than the sum of its proper divisors (310667051).

855799509 is a wasteful number, since it uses less digits than its factorization.

855799509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30840.

The product of its (nonzero) digits is 5103000, while the sum is 57.

The square root of 855799509 is about 29254.0511553528. The cubic root of 855799509 is about 949.4177444085.

The spelling of 855799509 in words is "eight hundred fifty-five million, seven hundred ninety-nine thousand, five hundred nine".