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BaseRepresentation
bin111101000110001010001
310202201020012
413220301101
51003031001
6110524305
723005511
oct7506121
93681205
102002001
111148151
12806695
13551321
143a1841
152982bb
hex1e8c51

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.

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

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

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

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).

22002001 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.

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