871561207 has 4 divisors (see below), whose sum is σ = 950794056. Its totient is φ = 792328360.

The previous prime is 871561169. The next prime is 871561213. The reversal of 871561207 is 702165178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 871561207 - 2⁷ = 871561079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871561237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39616408 + ... + 39616429.

It is an arithmetic number, because the mean of its divisors is an integer number (237698514).

Almost surely, 2^871561207 is an apocalyptic number.

871561207 is a deficient number, since it is larger than the sum of its proper divisors (79232849).

871561207 is a wasteful number, since it uses less digits than its factorization.

871561207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79232848.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 871561207 is about 29522.2154825819. The cubic root of 871561207 is about 955.2109607688.

The spelling of 871561207 in words is "eight hundred seventy-one million, five hundred sixty-one thousand, two hundred seven".