82508009 has 2 divisors, whose sum is σ = 82508010. Its totient is φ = 82508008.

The previous prime is 82507981. The next prime is 82508071. The reversal of 82508009 is 90080528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55830784 + 26677225 = 7472^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 82508009 - 2¹² = 82503913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82108009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41254004 + 41254005.

It is an arithmetic number, because the mean of its divisors is an integer number (41254005).

Almost surely, 2^82508009 is an apocalyptic number.

It is an amenable number.

82508009 is a deficient number, since it is larger than the sum of its proper divisors (1).

82508009 is an equidigital number, since it uses as much as digits as its factorization.

82508009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 82508009 is about 9083.3919325327. The cubic root of 82508009 is about 435.3434711858.

The spelling of 82508009 in words is "eighty-two million, five hundred eight thousand, nine".