180530809 has 2 divisors, whose sum is σ = 180530810. Its totient is φ = 180530808.

The previous prime is 180530747. The next prime is 180530873. The reversal of 180530809 is 908035081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99440784 + 81090025 = 9972^2 + 9005^2 .

It is a cyclic number.

It is not a de Polignac number, because 180530809 - 2⁷ = 180530681 is a prime.

It is not a weakly prime, because it can be changed into another prime (180530309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90265404 + 90265405.

It is an arithmetic number, because the mean of its divisors is an integer number (90265405).

Almost surely, 2^180530809 is an apocalyptic number.

It is an amenable number.

180530809 is a deficient number, since it is larger than the sum of its proper divisors (1).

180530809 is an equidigital number, since it uses as much as digits as its factorization.

180530809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 180530809 is about 13436.1753858753. The cubic root of 180530809 is about 565.1760842039.

The spelling of 180530809 in words is "one hundred eighty million, five hundred thirty thousand, eight hundred nine".