1000001001 has 8 divisors (see below), whose sum is σ = 1333856160. Its totient is φ = 666406592.

The previous prime is 1000000993. The next prime is 1000001011. The reversal of 1000001001 is 1001000001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000001001 - 2³ = 1000000993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (3).

1000001001 is a modest number, since divided by 1001 gives 1000 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1000001011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56055 + ... + 71708.

It is an arithmetic number, because the mean of its divisors is an integer number (166732020).

Almost surely, 2^1000001001 is an apocalyptic number.

It is an amenable number.

1000001001 is a deficient number, since it is larger than the sum of its proper divisors (333855159).

1000001001 is a wasteful number, since it uses less digits than its factorization.

1000001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130375.

The product of its (nonzero) digits is 1, while the sum is 3.

The square root of 1000001001 is about 31622.7924288795. The cubic root of 1000001001 is about 1000.0003336666. Note that the first 3 decimals are identical.

Adding to 1000001001 its reverse (1001000001), we get a palindrome (2001001002).

The spelling of 1000001001 in words is "one billion, one thousand, one".