84171521 has 8 divisors (see below), whose sum is σ = 97773504. Its totient is φ = 70963920.

The previous prime is 84171491. The next prime is 84171523. The reversal of 84171521 is 12517148.

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 84171521 - 2⁶ = 84171457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84171523) 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, 98135 + ... + 98988.

It is an arithmetic number, because the mean of its divisors is an integer number (12221688).

Almost surely, 2^84171521 is an apocalyptic number.

It is an amenable number.

84171521 is a deficient number, since it is larger than the sum of its proper divisors (13601983).

84171521 is a wasteful number, since it uses less digits than its factorization.

84171521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197191.

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

The square root of 84171521 is about 9174.5038557951. The cubic root of 84171521 is about 438.2497984331.

Adding to 84171521 its reverse (12517148), we get a palindrome (96688669).

The spelling of 84171521 in words is "eighty-four million, one hundred seventy-one thousand, five hundred twenty-one".