809957809 has 8 divisors (see below), whose sum is σ = 863284608. Its totient is φ = 757262400.

The previous prime is 809957807. The next prime is 809957831. The reversal of 809957809 is 908759908.

809957809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 809957809 - 2¹ = 809957807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 809957809.

It is not an unprimeable number, because it can be changed into a prime (809957807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155197 + ... + 160330.

It is an arithmetic number, because the mean of its divisors is an integer number (107910576).

Almost surely, 2^809957809 is an apocalyptic number.

It is an amenable number.

809957809 is a deficient number, since it is larger than the sum of its proper divisors (53326799).

809957809 is a wasteful number, since it uses less digits than its factorization.

809957809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315695.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 809957809 is about 28459.7577115477. The cubic root of 809957809 is about 932.1535666599.

It can be divided in two parts, 80995 and 7809, that added together give a square (88804 = 298²).

The spelling of 809957809 in words is "eight hundred nine million, nine hundred fifty-seven thousand, eight hundred nine".