200120102009 has 2 divisors, whose sum is σ = 200120102010. Its totient is φ = 200120102008.

The previous prime is 200120102003. The next prime is 200120102029. The reversal of 200120102009 is 900201021002.

200120102009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168559513600 + 31560588409 = 410560^2 + 177653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200120102009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (200120102003) 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, 100060051004 + 100060051005.

It is an arithmetic number, because the mean of its divisors is an integer number (100060051005).

Almost surely, 2^200120102009 is an apocalyptic number.

It is an amenable number.

200120102009 is a deficient number, since it is larger than the sum of its proper divisors (1).

200120102009 is an equidigital number, since it uses as much as digits as its factorization.

200120102009 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 spelling of 200120102009 in words is "two hundred billion, one hundred twenty million, one hundred two thousand, nine".