2001222009 has 12 divisors (see below), whose sum is σ = 2909067876. Its totient is φ = 1325649312.

The previous prime is 2001222001. The next prime is 2001222011. The reversal of 2001222009 is 9002221002.

It can be written as a sum of positive squares in 2 ways, for example, as 1137038400 + 864183609 = 33720^2 + 29397^2 .

It is not a de Polignac number, because 2001222009 - 2³ = 2001222001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001221982 and 2001222000.

It is not an unprimeable number, because it can be changed into a prime (2001222001) 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 11 ways as a sum of consecutive naturals, for example, 706734 + ... + 709559.

It is an arithmetic number, because the mean of its divisors is an integer number (242422323).

Almost surely, 2^2001222009 is an apocalyptic number.

It is an amenable number.

2001222009 is a deficient number, since it is larger than the sum of its proper divisors (907845867).

2001222009 is a wasteful number, since it uses less digits than its factorization.

2001222009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416456 (or 1416453 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2001222009 is about 44735.0199396401. The cubic root of 2001222009 is about 1260.1776034605.

The spelling of 2001222009 in words is "two billion, one million, two hundred twenty-two thousand, nine".