82016521 has 4 divisors (see below), whose sum is σ = 86333200. Its totient is φ = 77699844.

The previous prime is 82016503. The next prime is 82016527. The reversal of 82016521 is 12561028.

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 82016521 - 2⁵ = 82016489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82016527) 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, 2158311 + ... + 2158348.

It is an arithmetic number, because the mean of its divisors is an integer number (21583300).

Almost surely, 2^82016521 is an apocalyptic number.

It is an amenable number.

82016521 is a deficient number, since it is larger than the sum of its proper divisors (4316679).

82016521 is a wasteful number, since it uses less digits than its factorization.

82016521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4316678.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 82016521 is about 9056.2973118157. The cubic root of 82016521 is about 434.4773235195.

Adding to 82016521 its reverse (12561028), we get a palindrome (94577549).

The spelling of 82016521 in words is "eighty-two million, sixteen thousand, five hundred twenty-one".