871091979 has 16 divisors (see below), whose sum is σ = 1191590400. Its totient is φ = 565731936.

The previous prime is 871091959. The next prime is 871091983. The reversal of 871091979 is 979190178.

It is not a de Polignac number, because 871091979 - 2¹¹ = 871089931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (871091929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41502 + ... + 58860.

It is an arithmetic number, because the mean of its divisors is an integer number (74474400).

Almost surely, 2^871091979 is an apocalyptic number.

871091979 is a deficient number, since it is larger than the sum of its proper divisors (320498421).

871091979 is a wasteful number, since it uses less digits than its factorization.

871091979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17794.

The product of its (nonzero) digits is 285768, while the sum is 51.

The square root of 871091979 is about 29514.2673803705. The cubic root of 871091979 is about 955.0395089783.

The spelling of 871091979 in words is "eight hundred seventy-one million, ninety-one thousand, nine hundred seventy-nine".