8180001209 has 2 divisors, whose sum is σ = 8180001210. Its totient is φ = 8180001208.

The previous prime is 8180001169. The next prime is 8180001233. The reversal of 8180001209 is 9021000818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5061895609 + 3118105600 = 71147^2 + 55840^2 .

It is a cyclic number.

It is not a de Polignac number, because 8180001209 - 2⁸ = 8180000953 is a prime.

It is not a weakly prime, because it can be changed into another prime (8180001509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4090000604 + 4090000605.

It is an arithmetic number, because the mean of its divisors is an integer number (4090000605).

Almost surely, 2^8180001209 is an apocalyptic number.

It is an amenable number.

8180001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

8180001209 is an equidigital number, since it uses as much as digits as its factorization.

8180001209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 8180001209 is about 90443.3591205015. The cubic root of 8180001209 is about 2014.8889847648. Note that the first 3 decimals are identical.

The spelling of 8180001209 in words is "eight billion, one hundred eighty million, one thousand, two hundred nine".