84891791 has 8 divisors (see below), whose sum is σ = 89541120. Its totient is φ = 80260632.

The previous prime is 84891731. The next prime is 84891797. The reversal of 84891791 is 19719848.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84891791 - 2¹⁸ = 84629647 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 (84891797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5666 + ... + 14208.

It is an arithmetic number, because the mean of its divisors is an integer number (11192640).

Almost surely, 2^84891791 is an apocalyptic number.

84891791 is a deficient number, since it is larger than the sum of its proper divisors (4649329).

84891791 is a wasteful number, since it uses less digits than its factorization.

84891791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9085.

The product of its digits is 145152, while the sum is 47.

The square root of 84891791 is about 9213.6741314201. The cubic root of 84891791 is about 439.4963089491.

The spelling of 84891791 in words is "eighty-four million, eight hundred ninety-one thousand, seven hundred ninety-one".