1200000992009 has 2 divisors, whose sum is σ = 1200000992010. Its totient is φ = 1200000992008.

The previous prime is 1200000991967. The next prime is 1200000992077. The reversal of 1200000992009 is 9002990000021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 702919590409 + 497081401600 = 838403^2 + 705040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200000992009 - 2⁸ = 1200000991753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200000992809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600000496004 + 600000496005.

It is an arithmetic number, because the mean of its divisors is an integer number (600000496005).

Almost surely, 2^{1200000992009} is an apocalyptic number.

It is an amenable number.

1200000992009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200000992009 is an equidigital number, since it uses as much as digits as its factorization.

1200000992009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 1200000992009 in words is "one trillion, two hundred billion, nine hundred ninety-two thousand, nine".