100001001 has 4 divisors (see below), whose sum is σ = 133334672. Its totient is φ = 66667332.

The previous prime is 100000969. The next prime is 100001029. The reversal of 100001001 is 100100001.

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 not a de Polignac number, because 100001001 - 2⁵ = 100000969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (3), and also a Moran number because the ratio is a prime number: 33333667 = 100001001 / (1 + 0 + 0 + 0 + 0 + 1 + 0 + 0 + 1).

It is a Duffinian number.

100001001 is a modest number, since divided by 1001 gives 100 as remainder.

It is not an unprimeable number, because it can be changed into a prime (100001081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16666831 + ... + 16666836.

It is an arithmetic number, because the mean of its divisors is an integer number (33333668).

Almost surely, 2^100001001 is an apocalyptic number.

It is an amenable number.

100001001 is a deficient number, since it is larger than the sum of its proper divisors (33333671).

100001001 is an equidigital number, since it uses as much as digits as its factorization.

100001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333670.

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

The square root of 100001001 is about 10000.0500498748. The cubic root of 100001001 is about 464.1604320996.

Adding to 100001001 its reverse (100100001), we get a palindrome (200101002).

The spelling of 100001001 in words is "one hundred million, one thousand, one".