82163209 has 2 divisors, whose sum is σ = 82163210. Its totient is φ = 82163208.

The previous prime is 82163173. The next prime is 82163251. The reversal of 82163209 is 90236128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55175184 + 26988025 = 7428^2 + 5195^2 .

It is a cyclic number.

It is not a de Polignac number, because 82163209 - 2⁹ = 82162697 is a prime.

It is not a weakly prime, because it can be changed into another prime (82163269) 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, 41081604 + 41081605.

It is an arithmetic number, because the mean of its divisors is an integer number (41081605).

Almost surely, 2^82163209 is an apocalyptic number.

It is an amenable number.

82163209 is a deficient number, since it is larger than the sum of its proper divisors (1).

82163209 is an equidigital number, since it uses as much as digits as its factorization.

82163209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 82163209 is about 9064.3923679417. The cubic root of 82163209 is about 434.7361927121.

The spelling of 82163209 in words is "eighty-two million, one hundred sixty-three thousand, two hundred nine".