800509409 has 4 divisors (see below), whose sum is σ = 914867904. Its totient is φ = 686150916.

The previous prime is 800509399. The next prime is 800509427. The reversal of 800509409 is 904905008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 800509409 - 2⁸ = 800509153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800509469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57179237 + ... + 57179250.

It is an arithmetic number, because the mean of its divisors is an integer number (228716976).

Almost surely, 2^800509409 is an apocalyptic number.

It is an amenable number.

800509409 is a deficient number, since it is larger than the sum of its proper divisors (114358495).

800509409 is a wasteful number, since it uses less digits than its factorization.

800509409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114358494.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 800509409 is about 28293.2749783407. The cubic root of 800509409 is about 928.5147638423.

The spelling of 800509409 in words is "eight hundred million, five hundred nine thousand, four hundred nine".