84171489 has 4 divisors (see below), whose sum is σ = 112228656. Its totient is φ = 56114324.

The previous prime is 84171457. The next prime is 84171491. The reversal of 84171489 is 98417148.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84171489 - 2⁵ = 84171457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84171489.

It is not an unprimeable number, because it can be changed into a prime (84171449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14028579 + ... + 14028584.

It is an arithmetic number, because the mean of its divisors is an integer number (28057164).

Almost surely, 2^84171489 is an apocalyptic number.

It is an amenable number.

84171489 is a deficient number, since it is larger than the sum of its proper divisors (28057167).

84171489 is a wasteful number, since it uses less digits than its factorization.

84171489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28057166.

The product of its digits is 64512, while the sum is 42.

The square root of 84171489 is about 9174.5021118315. The cubic root of 84171489 is about 438.2497428957.

The spelling of 84171489 in words is "eighty-four million, one hundred seventy-one thousand, four hundred eighty-nine".