82059721 has 2 divisors, whose sum is σ = 82059722. Its totient is φ = 82059720.

The previous prime is 82059713. The next prime is 82059739. The reversal of 82059721 is 12795028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76125625 + 5934096 = 8725^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 82059721 - 2³ = 82059713 is a prime.

It is not a weakly prime, because it can be changed into another prime (82059751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41029860 + 41029861.

It is an arithmetic number, because the mean of its divisors is an integer number (41029861).

Almost surely, 2^82059721 is an apocalyptic number.

It is an amenable number.

82059721 is a deficient number, since it is larger than the sum of its proper divisors (1).

82059721 is an equidigital number, since it uses as much as digits as its factorization.

82059721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 82059721 is about 9058.6820785366. The cubic root of 82059721 is about 434.5535932177.

The spelling of 82059721 in words is "eighty-two million, fifty-nine thousand, seven hundred twenty-one".