2001002001 has 32 divisors (see below), whose sum is σ = 2908811520. Its totient is φ = 1219680000.

The previous prime is 2001001997. The next prime is 2001002011. The reversal of 2001002001 is 1002001002.

It is a happy number.

It is not a de Polignac number, because 2001002001 - 2² = 2001001997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001002011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197151 + ... + 207051.

It is an arithmetic number, because the mean of its divisors is an integer number (90900360).

Almost surely, 2^2001002001 is an apocalyptic number.

It is an amenable number.

2001002001 is a deficient number, since it is larger than the sum of its proper divisors (907809519).

2001002001 is a wasteful number, since it uses less digits than its factorization.

2001002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057.

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

The square root of 2001002001 is about 44732.5608589537. The cubic root of 2001002001 is about 1260.1314217920.

Adding to 2001002001 its reverse (1002001002), we get a palindrome (3003003003).

Subtracting from 2001002001 its reverse (1002001002), we obtain a palindrome (999000999).

It can be divided in two parts, 200100 and 2001, that multiplied together give a square (400400100 = 20010²).

The spelling of 2001002001 in words is "two billion, one million, two thousand, one".