1001005 has 4 divisors (see below), whose sum is σ = 1201212. Its totient is φ = 800800.

The previous prime is 1001003. The next prime is 1001017. The reversal of 1001005 is 5001001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 174724 + 826281 = 418^2 + 909^2 .

It is not a de Polignac number, because 1001005 - 2¹ = 1001003 is a prime.

It is a super-2 number, since 2×1001005² = 2004022020050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001003) 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, 100096 + ... + 100105.

It is an arithmetic number, because the mean of its divisors is an integer number (300303).

2^1001005 is an apocalyptic number.

It is an amenable number.

1001005 is a deficient number, since it is larger than the sum of its proper divisors (200207).

1001005 is an equidigital number, since it uses as much as digits as its factorization.

1001005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200206.

The product of its (nonzero) digits is 5, while the sum is 7.

The square root of 1001005 is about 1000.5023738103. The cubic root of 1001005 is about 100.0334887838.

Adding to 1001005 its reverse (5001001), we get a palindrome (6002006).

It can be divided in two parts, 100100 and 5, that multiplied together give a triangular number (500500 = T₁₀₀₀).

The spelling of 1001005 in words is "one million, one thousand, five".