2002001 has 2 divisors, whose sum is σ = 2002002. Its totient is φ = 2002000.

The previous prime is 2001997. The next prime is 2002009. The reversal of 2002001 is 1002002.

2002001 = 1000² + 1001².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002001 + 1000000 = 1001^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002001 - 2² = 2001997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2002009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001000 + 1001001.

It is an arithmetic number, because the mean of its divisors is an integer number (1001001).

2^2002001 is an apocalyptic number.

2002001 is the 1001-st centered square number.

It is an amenable number.

2002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002001 is an equidigital number, since it uses as much as digits as its factorization.

2002001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 2002001 is about 1414.9208458426. The cubic root of 2002001 is about 126.0341093512.

Adding to 2002001 its reverse (1002002), we get a palindrome (3004003).

Subtracting from 2002001 its reverse (1002002), we obtain a palindrome (999999).

Multiplying 2002001 by its reverse (1002002), we get a palindrome (2006009006002).

The spelling of 2002001 in words is "two million, two thousand, one".