83821081 has 2 divisors, whose sum is σ = 83821082. Its totient is φ = 83821080.

The previous prime is 83821079. The next prime is 83821093. The reversal of 83821081 is 18012838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 7056 = 9155^2 + 84^2 .

It is a cyclic number.

It is not a de Polignac number, because 83821081 - 2¹ = 83821079 is a prime.

It is a super-2 number, since 2×83821081² = 14051947240017122, which contains 22 as substring.

Together with 83821079, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83821181) 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 as a sum of consecutive naturals, namely, 41910540 + 41910541.

It is an arithmetic number, because the mean of its divisors is an integer number (41910541).

Almost surely, 2^83821081 is an apocalyptic number.

It is an amenable number.

83821081 is a deficient number, since it is larger than the sum of its proper divisors (1).

83821081 is an equidigital number, since it uses as much as digits as its factorization.

83821081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 83821081 is about 9155.3853550793. The cubic root of 83821081 is about 437.6407488371.

The spelling of 83821081 in words is "eighty-three million, eight hundred twenty-one thousand, eighty-one".