1001440001 has 4 divisors (see below), whose sum is σ = 1002225492. Its totient is φ = 1000654512.

The previous prime is 1001439983. The next prime is 1001440021. The reversal of 1001440001 is 1000441001.

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 475196401 + 526243600 = 21799^2 + 22940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001440001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001440021) 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, 390830 + ... + 393383.

It is an arithmetic number, because the mean of its divisors is an integer number (250556373).

Almost surely, 2^1001440001 is an apocalyptic number.

It is an amenable number.

1001440001 is a deficient number, since it is larger than the sum of its proper divisors (785491).

1001440001 is an equidigital number, since it uses as much as digits as its factorization.

1001440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785490.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1001440001 is about 31645.5368259096. The cubic root of 1001440001 is about 1000.4797701172.

Adding to 1001440001 its reverse (1000441001), we get a palindrome (2001881002).

The spelling of 1001440001 in words is "one billion, one million, four hundred forty thousand, one".