85889871971 has 4 divisors (see below), whose sum is σ = 85922176200. Its totient is φ = 85857567744.

The previous prime is 85889871959. The next prime is 85889871979. The reversal of 85889871971 is 17917898858.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85889871971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85889871895 and 85889871904.

It is not an unprimeable number, because it can be changed into a prime (85889871979) 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, 16148126 + ... + 16153443.

It is an arithmetic number, because the mean of its divisors is an integer number (21480544050).

Almost surely, 2^85889871971 is an apocalyptic number.

85889871971 is a deficient number, since it is larger than the sum of its proper divisors (32304229).

85889871971 is a wasteful number, since it uses less digits than its factorization.

85889871971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32304228.

The product of its digits is 81285120, while the sum is 71.

It can be divided in two parts, 8588987 and 1971, that added together give a palindrome (8590958).

The spelling of 85889871971 in words is "eighty-five billion, eight hundred eighty-nine million, eight hundred seventy-one thousand, nine hundred seventy-one".