2001200001 has 4 divisors (see below), whose sum is σ = 2668266672. Its totient is φ = 1334133332.

The previous prime is 2001199979. The next prime is 2001200011. The reversal of 2001200001 is 1000021002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001200001 - 2¹¹ = 2001197953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001200011) 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, 333533331 + ... + 333533336.

It is an arithmetic number, because the mean of its divisors is an integer number (667066668).

Almost surely, 2^2001200001 is an apocalyptic number.

It is an amenable number.

2001200001 is a deficient number, since it is larger than the sum of its proper divisors (667066671).

2001200001 is an equidigital number, since it uses as much as digits as its factorization.

2001200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667066670.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 2001200001 is about 44734.7739571801. The cubic root of 2001200001 is about 1260.1729839347.

Adding to 2001200001 its reverse (1000021002), we get a palindrome (3001221003).

The spelling of 2001200001 in words is "two billion, one million, two hundred thousand, one".