84189491 has 4 divisors (see below), whose sum is σ = 89141832. Its totient is φ = 79237152.

The previous prime is 84189481. The next prime is 84189503. The reversal of 84189491 is 19498148.

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-84189491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84189421) 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, 2476145 + ... + 2476178.

It is an arithmetic number, because the mean of its divisors is an integer number (22285458).

Almost surely, 2^84189491 is an apocalyptic number.

84189491 is a deficient number, since it is larger than the sum of its proper divisors (4952341).

84189491 is a wasteful number, since it uses less digits than its factorization.

84189491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952340.

The product of its digits is 82944, while the sum is 44.

The square root of 84189491 is about 9175.4831480419. The cubic root of 84189491 is about 438.2809839156.

The spelling of 84189491 in words is "eighty-four million, one hundred eighty-nine thousand, four hundred ninety-one".