82877209 has 2 divisors, whose sum is σ = 82877210. Its totient is φ = 82877208.

The previous prime is 82877203. The next prime is 82877219. The reversal of 82877209 is 90277828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76947984 + 5929225 = 8772^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 82877209 - 2⁵ = 82877177 is a prime.

It is not a weakly prime, because it can be changed into another prime (82877203) 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, 41438604 + 41438605.

It is an arithmetic number, because the mean of its divisors is an integer number (41438605).

Almost surely, 2^82877209 is an apocalyptic number.

It is an amenable number.

82877209 is a deficient number, since it is larger than the sum of its proper divisors (1).

82877209 is an equidigital number, since it uses as much as digits as its factorization.

82877209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 82877209 is about 9103.6920532276. The cubic root of 82877209 is about 435.9918513333.

The spelling of 82877209 in words is "eighty-two million, eight hundred seventy-seven thousand, two hundred nine".