2001289 has 4 divisors (see below), whose sum is σ = 2106640. Its totient is φ = 1895940.

The previous prime is 2001281. The next prime is 2001313. The reversal of 2001289 is 9821002.

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 2001289 - 2³ = 2001281 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52647 + ... + 52684.

It is an arithmetic number, because the mean of its divisors is an integer number (526660).

2^2001289 is an apocalyptic number.

It is an amenable number.

2001289 is a deficient number, since it is larger than the sum of its proper divisors (105351).

2001289 is a wasteful number, since it uses less digits than its factorization.

2001289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105350.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2001289 is about 1414.6692192877. The cubic root of 2001289 is about 126.0191664805.

The spelling of 2001289 in words is "two million, one thousand, two hundred eighty-nine".