809791047 has 48 divisors (see below), whose sum is σ = 1312446720. Its totient is φ = 493208352.

The previous prime is 809791019. The next prime is 809791049. The reversal of 809791047 is 740197908.

It is not a de Polignac number, because 809791047 - 2⁸ = 809790791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 809790993 and 809791011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809791049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 469128 + ... + 470850.

It is an arithmetic number, because the mean of its divisors is an integer number (27342640).

Almost surely, 2^809791047 is an apocalyptic number.

809791047 is a deficient number, since it is larger than the sum of its proper divisors (502655673).

809791047 is a wasteful number, since it uses less digits than its factorization.

809791047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861 (or 1842 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 809791047 is about 28456.8277747187. The cubic root of 809791047 is about 932.0895886514.

The spelling of 809791047 in words is "eight hundred nine million, seven hundred ninety-one thousand, forty-seven".