1000000001005 has 4 divisors (see below), whose sum is σ = 1200000001212. Its totient is φ = 800000000800.

The previous prime is 1000000000997. The next prime is 1000000001051. The reversal of 1000000001005 is 5001000000001.

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 654315974404 + 345684026601 = 808898^2 + 587949^2 .

It is not a de Polignac number, because 1000000001005 - 2³ = 1000000000997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100000000096 + ... + 100000000105.

It is an arithmetic number, because the mean of its divisors is an integer number (300000000303).

Almost surely, 2^{1000000001005} is an apocalyptic number.

It is an amenable number.

1000000001005 is a deficient number, since it is larger than the sum of its proper divisors (200000000207).

1000000001005 is an equidigital number, since it uses as much as digits as its factorization.

1000000001005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200000000206.

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

Adding to 1000000001005 its reverse (5001000000001), we get a palindrome (6001000001006).

The spelling of 1000000001005 in words is "one trillion, one thousand, five".