9912051209 has 2 divisors, whose sum is σ = 9912051210. Its totient is φ = 9912051208.

The previous prime is 9912051199. The next prime is 9912051211. The reversal of 9912051209 is 9021502199.

9912051209 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5497777609 + 4414273600 = 74147^2 + 66440^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912051209 - 2¹² = 9912047113 is a prime.

Together with 9912051211, 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 (9912071209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956025604 + 4956025605.

It is an arithmetic number, because the mean of its divisors is an integer number (4956025605).

Almost surely, 2^9912051209 is an apocalyptic number.

It is an amenable number.

9912051209 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912051209 is an equidigital number, since it uses as much as digits as its factorization.

9912051209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 9912051209 is about 99559.2848959855. The cubic root of 9912051209 is about 2148.1000853398.

The spelling of 9912051209 in words is "nine billion, nine hundred twelve million, fifty-one thousand, two hundred nine".