1001559 has 16 divisors (see below), whose sum is σ = 1465184. Its totient is φ = 604800.

The previous prime is 1001551. The next prime is 1001563. The reversal of 1001559 is 9551001.

It is a happy number.

It is not a de Polignac number, because 1001559 - 2³ = 1001551 is a prime.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001551) 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 15 ways as a sum of consecutive naturals, for example, 2169 + ... + 2589.

It is an arithmetic number, because the mean of its divisors is an integer number (91574).

2^1001559 is an apocalyptic number.

1001559 is a deficient number, since it is larger than the sum of its proper divisors (463625).

1001559 is a wasteful number, since it uses less digits than its factorization.

1001559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 1001559 is about 1000.7791964265. The cubic root of 1001559 is about 100.0519396847.

The spelling of 1001559 in words is "one million, one thousand, five hundred fifty-nine".