1200022009 has 4 divisors (see below), whose sum is σ = 1200091300. Its totient is φ = 1199952720.

The previous prime is 1200021983. The next prime is 1200022037. The reversal of 1200022009 is 9002200021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 782432784 + 417589225 = 27972^2 + 20435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200022009 - 2¹³ = 1200013817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200021983 and 1200022001.

It is not an unprimeable number, because it can be changed into a prime (1200022099) 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 in 3 ways as a sum of consecutive naturals, for example, 16567 + ... + 51715.

It is an arithmetic number, because the mean of its divisors is an integer number (300022825).

Almost surely, 2^1200022009 is an apocalyptic number.

It is an amenable number.

1200022009 is a deficient number, since it is larger than the sum of its proper divisors (69291).

1200022009 is an equidigital number, since it uses as much as digits as its factorization.

1200022009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69290.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1200022009 is about 34641.3338224728. Note that the first 3 decimals coincide. The cubic root of 1200022009 is about 1062.6650658241.

The spelling of 1200022009 in words is "one billion, two hundred million, twenty-two thousand, nine".