823056809 has 4 divisors (see below), whose sum is σ = 840568704. Its totient is φ = 805544916.

The previous prime is 823056803. The next prime is 823056811. The reversal of 823056809 is 908650328.

823056809 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, 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 823056809 - 2²⁰ = 822008233 is a prime.

It is a super-3 number, since 3×823056809³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (823056803) 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, 8755877 + ... + 8755970.

It is an arithmetic number, because the mean of its divisors is an integer number (210142176).

Almost surely, 2^823056809 is an apocalyptic number.

It is an amenable number.

823056809 is a deficient number, since it is larger than the sum of its proper divisors (17511895).

823056809 is a wasteful number, since it uses less digits than its factorization.

823056809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17511894.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 823056809 is about 28688.9666771043. The cubic root of 823056809 is about 937.1517863894.

The spelling of 823056809 in words is "eight hundred twenty-three million, fifty-six thousand, eight hundred nine".