1005509 has 4 divisors (see below), whose sum is σ = 1012320. Its totient is φ = 998700.

The previous prime is 1005503. The next prime is 1005527. The reversal of 1005509 is 9055001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9055001 = 19 ⋅476579.

It is a cyclic number.

It is not a de Polignac number, because 1005509 - 2⁴ = 1005493 is a prime.

It is a super-2 number, since 2×1005509² = 2022096698162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3179 + ... + 3480.

It is an arithmetic number, because the mean of its divisors is an integer number (253080).

2^1005509 is an apocalyptic number.

It is an amenable number.

1005509 is a deficient number, since it is larger than the sum of its proper divisors (6811).

1005509 is an equidigital number, since it uses as much as digits as its factorization.

1005509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 1005509 is about 1002.7507167786. The cubic root of 1005509 is about 100.1832971496.

The spelling of 1005509 in words is "one million, five thousand, five hundred nine".