2001287 has 4 divisors (see below), whose sum is σ = 2016696. Its totient is φ = 1985880.

The previous prime is 2001281. The next prime is 2001313. The reversal of 2001287 is 7821002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001287 - 2¹⁶ = 1935751 is a prime.

It is a Duffinian number.

2001287 is a modest number, since divided by 1287 gives 2 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7508 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (504174).

2^2001287 is an apocalyptic number.

2001287 is a deficient number, since it is larger than the sum of its proper divisors (15409).

2001287 is a wasteful number, since it uses less digits than its factorization.

2001287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15408.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 2001287 is about 1414.6685124085. The cubic root of 2001287 is about 126.0191245012.

Adding to 2001287 its reverse (7821002), we get a palindrome (9822289).

The spelling of 2001287 in words is "two million, one thousand, two hundred eighty-seven".