82109219 has 2 divisors, whose sum is σ = 82109220. Its totient is φ = 82109218.

The previous prime is 82109189. The next prime is 82109227. The reversal of 82109219 is 91290128.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82109219 - 2¹² = 82105123 is a prime.

It is a super-2 number, since 2×82109219² = 13483847689579922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82109249) 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, 41054609 + 41054610.

It is an arithmetic number, because the mean of its divisors is an integer number (41054610).

Almost surely, 2^82109219 is an apocalyptic number.

82109219 is a deficient number, since it is larger than the sum of its proper divisors (1).

82109219 is an equidigital number, since it uses as much as digits as its factorization.

82109219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 82109219 is about 9061.4137417955. The cubic root of 82109219 is about 434.6409491504.

It can be divided in two parts, 82109 and 219, that added together give a palindrome (82328).

The spelling of 82109219 in words is "eighty-two million, one hundred nine thousand, two hundred nineteen".