1200111100009 has 2 divisors, whose sum is σ = 1200111100010. Its totient is φ = 1200111100008.

The previous prime is 1200111100003. The next prime is 1200111100051. The reversal of 1200111100009 is 9000011110021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153604883600 + 46506216409 = 1074060^2 + 215653^2 .

It is an emirp because it is prime and its reverse (9000011110021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200111100009 - 2⁵ = 1200111099977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200111099965 and 1200111100001.

It is not a weakly prime, because it can be changed into another prime (1200111100003) 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, 600055550004 + 600055550005.

It is an arithmetic number, because the mean of its divisors is an integer number (600055550005).

Almost surely, 2^{1200111100009} is an apocalyptic number.

It is an amenable number.

1200111100009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200111100009 is an equidigital number, since it uses as much as digits as its factorization.

1200111100009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 1200111100009 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred thousand, nine".