10001001 has 8 divisors (see below), whose sum is σ = 13367200. Its totient is φ = 6651072.

The previous prime is 10000993. The next prime is 10001009. The reversal of 10001001 is 10010001.

It is an interprime number because it is at equal distance from previous prime (10000993) and next prime (10001009).

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

It is not a de Polignac number, because 10001001 - 2³ = 10000993 is a prime.

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

It is a Duffinian number.

10001001 is a modest number, since divided by 1001 gives 10 as remainder.

It is not an unprimeable number, because it can be changed into a prime (10001009) 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 7 ways as a sum of consecutive naturals, for example, 2551 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (1670900).

Almost surely, 2^10001001 is an apocalyptic number.

It is an amenable number.

10001001 is a deficient number, since it is larger than the sum of its proper divisors (3366199).

10001001 is an equidigital number, since it uses as much as digits as its factorization.

10001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8135.

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

The square root of 10001001 is about 3162.4359282047. The cubic root of 10001001 is about 215.4506573938.

Adding to 10001001 its reverse (10010001), we get a palindrome (20011002).

Multiplying 10001001 by its reverse (10010001), we get a palindrome (100110030011001).

The spelling of 10001001 in words is "ten million, one thousand, one".