859980871 has 4 divisors (see below), whose sum is σ = 861074392. Its totient is φ = 858887352.

The previous prime is 859980859. The next prime is 859980893. The reversal of 859980871 is 178089958.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178089958 = 2 ⋅89044979.

It is a cyclic number.

It is not a de Polignac number, because 859980871 - 2⁵ = 859980839 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 (859980271) 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, 545580 + ... + 547153.

It is an arithmetic number, because the mean of its divisors is an integer number (215268598).

Almost surely, 2^859980871 is an apocalyptic number.

859980871 is a deficient number, since it is larger than the sum of its proper divisors (1093521).

859980871 is a wasteful number, since it uses less digits than its factorization.

859980871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093520.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The square root of 859980871 is about 29325.4304486737. The cubic root of 859980871 is about 950.9614904484.

The spelling of 859980871 in words is "eight hundred fifty-nine million, nine hundred eighty thousand, eight hundred seventy-one".