2001022009 has 16 divisors (see below), whose sum is σ = 2429336448. Its totient is φ = 1608982272.

The previous prime is 2001021989. The next prime is 2001022061. The reversal of 2001022009 is 9002201002.

It is a happy number.

It is not a de Polignac number, because 2001022009 - 2¹⁷ = 2000890937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001021983 and 2001022001.

It is not an unprimeable number, because it can be changed into a prime (2001022099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9147 + ... + 63919.

It is an arithmetic number, because the mean of its divisors is an integer number (151833528).

Almost surely, 2^2001022009 is an apocalyptic number.

It is an amenable number.

2001022009 is a deficient number, since it is larger than the sum of its proper divisors (428314439).

2001022009 is a wasteful number, since it uses less digits than its factorization.

2001022009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55104.

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

The square root of 2001022009 is about 44732.7844986202. The cubic root of 2001022009 is about 1260.1356217920.

The spelling of 2001022009 in words is "two billion, one million, twenty-two thousand, nine".