1005000001 has 4 divisors (see below), whose sum is σ = 1017721600. Its totient is φ = 992278404.

The previous prime is 1004999987. The next prime is 1005000047. The reversal of 1005000001 is 1000005001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1005000001 - 2⁵ = 1004999969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005000091) 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, 6360681 + ... + 6360838.

It is an arithmetic number, because the mean of its divisors is an integer number (254430400).

Almost surely, 2^1005000001 is an apocalyptic number.

It is an amenable number.

1005000001 is a deficient number, since it is larger than the sum of its proper divisors (12721599).

1005000001 is an equidigital number, since it uses as much as digits as its factorization.

1005000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12721598.

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

The square root of 1005000001 is about 31701.7349840667. The cubic root of 1005000001 is about 1001.6638969115.

Adding to 1005000001 its reverse (1000005001), we get a palindrome (2005005002).

The spelling of 1005000001 in words is "one billion, five million, one", and thus it is an aban number and an uban number.