2012001209 has 2 divisors, whose sum is σ = 2012001210. Its totient is φ = 2012001208.

The previous prime is 2012001203. The next prime is 2012001217. The reversal of 2012001209 is 9021002102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1948957609 + 63043600 = 44147^2 + 7940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012001209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2012001203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006000604 + 1006000605.

It is an arithmetic number, because the mean of its divisors is an integer number (1006000605).

Almost surely, 2^2012001209 is an apocalyptic number.

It is an amenable number.

2012001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012001209 is an equidigital number, since it uses as much as digits as its factorization.

2012001209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2012001209 is about 44855.3364606710. The cubic root of 2012001209 is about 1262.4361219061.

The spelling of 2012001209 in words is "two billion, twelve million, one thousand, two hundred nine".