82681321 has 4 divisors (see below), whose sum is σ = 83728000. Its totient is φ = 81634644.

The previous prime is 82681307. The next prime is 82681337. The reversal of 82681321 is 12318628.

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 82681321 - 2⁵ = 82681289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82681301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523221 + ... + 523378.

It is an arithmetic number, because the mean of its divisors is an integer number (20932000).

Almost surely, 2^82681321 is an apocalyptic number.

It is an amenable number.

82681321 is a deficient number, since it is larger than the sum of its proper divisors (1046679).

82681321 is a wasteful number, since it uses less digits than its factorization.

82681321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046678.

The product of its digits is 4608, while the sum is 31.

The square root of 82681321 is about 9092.9269765021. The cubic root of 82681321 is about 435.6480778990.

Adding to 82681321 its reverse (12318628), we get a palindrome (94999949).

The spelling of 82681321 in words is "eighty-two million, six hundred eighty-one thousand, three hundred twenty-one".