201999992009 has 2 divisors, whose sum is σ = 201999992010. Its totient is φ = 201999992008.

The previous prime is 201999992003. The next prime is 201999992011. The reversal of 201999992009 is 900299999102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129620160784 + 72379831225 = 360028^2 + 269035^2 .

It is a cyclic number.

It is not a de Polignac number, because 201999992009 - 2¹² = 201999987913 is a prime.

Together with 201999992011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201999992003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100999996004 + 100999996005.

It is an arithmetic number, because the mean of its divisors is an integer number (100999996005).

Almost surely, 2^201999992009 is an apocalyptic number.

It is an amenable number.

201999992009 is a deficient number, since it is larger than the sum of its proper divisors (1).

201999992009 is an equidigital number, since it uses as much as digits as its factorization.

201999992009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2125764, while the sum is 59.

The spelling of 201999992009 in words is "two hundred one billion, nine hundred ninety-nine million, nine hundred ninety-two thousand, nine".