84512171 has 4 divisors (see below), whose sum is σ = 88960200. Its totient is φ = 80064144.

The previous prime is 84512167. The next prime is 84512179. The reversal of 84512171 is 17121548.

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 84512171 - 2² = 84512167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84512179) 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, 2223986 + ... + 2224023.

It is an arithmetic number, because the mean of its divisors is an integer number (22240050).

Almost surely, 2^84512171 is an apocalyptic number.

84512171 is a deficient number, since it is larger than the sum of its proper divisors (4448029).

84512171 is a wasteful number, since it uses less digits than its factorization.

84512171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448028.

The product of its digits is 2240, while the sum is 29.

The square root of 84512171 is about 9193.0501467141. The cubic root of 84512171 is about 438.8402152672.

The spelling of 84512171 in words is "eighty-four million, five hundred twelve thousand, one hundred seventy-one".