871057809 has 24 divisors (see below), whose sum is σ = 1323309312. Its totient is φ = 551360160.

The previous prime is 871057787. The next prime is 871057813. The reversal of 871057809 is 908750178.

871057809 is a `hidden beast` number, since 8 + 71 + 0 + 578 + 0 + 9 = 666.

It is not a de Polignac number, because 871057809 - 2²⁰ = 870009233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (871057309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14667 + ... + 44240.

It is an arithmetic number, because the mean of its divisors is an integer number (55137888).

Almost surely, 2^871057809 is an apocalyptic number.

It is an amenable number.

871057809 is a deficient number, since it is larger than the sum of its proper divisors (452251503).

871057809 is a wasteful number, since it uses less digits than its factorization.

871057809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58997 (or 58994 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 871057809 is about 29513.6885021171. The cubic root of 871057809 is about 955.0270211555.

The spelling of 871057809 in words is "eight hundred seventy-one million, fifty-seven thousand, eight hundred nine".