82518821 has 16 divisors (see below), whose sum is σ = 103472640. Its totient is φ = 63930480.

The previous prime is 82518817. The next prime is 82518823. The reversal of 82518821 is 12881528.

It is a cyclic number.

It is not a de Polignac number, because 82518821 - 2² = 82518817 is a prime.

It is a super-3 number, since 3×82518821³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82518823) 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 15 ways as a sum of consecutive naturals, for example, 10790 + ... + 16776.

It is an arithmetic number, because the mean of its divisors is an integer number (6467040).

Almost surely, 2^82518821 is an apocalyptic number.

It is an amenable number.

82518821 is a deficient number, since it is larger than the sum of its proper divisors (20953819).

82518821 is a wasteful number, since it uses less digits than its factorization.

82518821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6184.

The product of its digits is 10240, while the sum is 35.

The square root of 82518821 is about 9083.9870651603. The cubic root of 82518821 is about 435.3624864228.

The spelling of 82518821 in words is "eighty-two million, five hundred eighteen thousand, eight hundred twenty-one".