2001559 has 4 divisors (see below), whose sum is σ = 2287504. Its totient is φ = 1715616.

The previous prime is 2001553. The next prime is 2001581. The reversal of 2001559 is 9551002.

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

It is not a de Polignac number, because 2001559 - 2¹¹ = 1999511 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001553) 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, 142962 + ... + 142975.

It is an arithmetic number, because the mean of its divisors is an integer number (571876).

2^2001559 is an apocalyptic number.

2001559 is a deficient number, since it is larger than the sum of its proper divisors (285945).

2001559 is an equidigital number, since it uses as much as digits as its factorization.

2001559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285944.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 2001559 is about 1414.7646447378. The cubic root of 2001559 is about 126.0248334356.

The spelling of 2001559 in words is "two million, one thousand, five hundred fifty-nine".