1200011999 has 4 divisors (see below), whose sum is σ = 1200289680. Its totient is φ = 1199734320.

The previous prime is 1200011987. The next prime is 1200012001. The reversal of 1200011999 is 9991100021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1200011999 - 2²⁸ = 931576543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200011299) 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 in 3 ways as a sum of consecutive naturals, for example, 132254 + ... + 141035.

It is an arithmetic number, because the mean of its divisors is an integer number (300072420).

Almost surely, 2^1200011999 is an apocalyptic number.

1200011999 is a deficient number, since it is larger than the sum of its proper divisors (277681).

1200011999 is an equidigital number, since it uses as much as digits as its factorization.

1200011999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277680.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1200011999 is about 34641.1893415916. The cubic root of 1200011999 is about 1062.6621110709.

The spelling of 1200011999 in words is "one billion, two hundred million, eleven thousand, nine hundred ninety-nine".