84971191 has 4 divisors (see below), whose sum is σ = 85016232. Its totient is φ = 84926152.

The previous prime is 84971179. The next prime is 84971207. The reversal of 84971191 is 19117948.

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 84971191 - 2²¹ = 82874039 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84971171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19561 + ... + 23506.

It is an arithmetic number, because the mean of its divisors is an integer number (21254058).

Almost surely, 2^84971191 is an apocalyptic number.

84971191 is a deficient number, since it is larger than the sum of its proper divisors (45041).

84971191 is a wasteful number, since it uses less digits than its factorization.

84971191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45040.

The product of its digits is 18144, while the sum is 40.

The square root of 84971191 is about 9217.9819374959. The cubic root of 84971191 is about 439.6332877730.

The spelling of 84971191 in words is "eighty-four million, nine hundred seventy-one thousand, one hundred ninety-one".