82684009 has 2 divisors, whose sum is σ = 82684010. Its totient is φ = 82684008.

The previous prime is 82684001. The next prime is 82684027. The reversal of 82684009 is 90048628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76947984 + 5736025 = 8772^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 82684009 - 2³ = 82684001 is a prime.

It is not a weakly prime, because it can be changed into another prime (82684001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41342004 + 41342005.

It is an arithmetic number, because the mean of its divisors is an integer number (41342005).

Almost surely, 2^82684009 is an apocalyptic number.

It is an amenable number.

82684009 is a deficient number, since it is larger than the sum of its proper divisors (1).

82684009 is an equidigital number, since it uses as much as digits as its factorization.

82684009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 82684009 is about 9093.0747824924. The cubic root of 82684009 is about 435.6527988740.

The spelling of 82684009 in words is "eighty-two million, six hundred eighty-four thousand, nine".