84989791 has 4 divisors (see below), whose sum is σ = 85198000. Its totient is φ = 84781584.

The previous prime is 84989789. The next prime is 84989809. The reversal of 84989791 is 19798948.

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 84989791 - 2¹ = 84989789 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 (84989741) 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, 103491 + ... + 104308.

It is an arithmetic number, because the mean of its divisors is an integer number (21299500).

Almost surely, 2^84989791 is an apocalyptic number.

84989791 is a deficient number, since it is larger than the sum of its proper divisors (208209).

84989791 is a wasteful number, since it uses less digits than its factorization.

84989791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208208.

The product of its digits is 1306368, while the sum is 55.

The square root of 84989791 is about 9218.9907799064. The cubic root of 84989791 is about 439.6653636741.

The spelling of 84989791 in words is "eighty-four million, nine hundred eighty-nine thousand, seven hundred ninety-one".