82109641 has 2 divisors, whose sum is σ = 82109642. Its totient is φ = 82109640.

The previous prime is 82109633. The next prime is 82109653. The reversal of 82109641 is 14690128.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 13286025 = 8296^2 + 3645^2 .

It is a cyclic number.

It is not a de Polignac number, because 82109641 - 2³ = 82109633 is a prime.

It is not a weakly prime, because it can be changed into another prime (82109681) 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, 41054820 + 41054821.

It is an arithmetic number, because the mean of its divisors is an integer number (41054821).

Almost surely, 2^82109641 is an apocalyptic number.

It is an amenable number.

82109641 is a deficient number, since it is larger than the sum of its proper divisors (1).

82109641 is an equidigital number, since it uses as much as digits as its factorization.

82109641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 82109641 is about 9061.4370273153. The cubic root of 82109641 is about 434.6416937609.

Adding to 82109641 its reverse (14690128), we get a palindrome (96799769).

The spelling of 82109641 in words is "eighty-two million, one hundred nine thousand, six hundred forty-one".