82161641 has 2 divisors, whose sum is σ = 82161642. Its totient is φ = 82161640.

The previous prime is 82161613. The next prime is 82161671. The reversal of 82161641 is 14616128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74321641 + 7840000 = 8621^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 82161641 - 2⁶ = 82161577 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (82161601) 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 as a sum of consecutive naturals, namely, 41080820 + 41080821.

It is an arithmetic number, because the mean of its divisors is an integer number (41080821).

Almost surely, 2^82161641 is an apocalyptic number.

It is an amenable number.

82161641 is a deficient number, since it is larger than the sum of its proper divisors (1).

82161641 is an equidigital number, since it uses as much as digits as its factorization.

82161641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 82161641 is about 9064.3058752449. The cubic root of 82161641 is about 434.7334271974.

Adding to 82161641 its reverse (14616128), we get a palindrome (96777769).

The spelling of 82161641 in words is "eighty-two million, one hundred sixty-one thousand, six hundred forty-one".