100011001 has 4 divisors (see below), whose sum is σ = 100031652. Its totient is φ = 99990352.

The previous prime is 100010993. The next prime is 100011029. The reversal of 100011001 is 100110001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100110001 = 29 ⋅3452069.

It can be written as a sum of positive squares in 2 ways, for example, as 71910400 + 28100601 = 8480^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 100011001 - 2³ = 100010993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100011031) 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, 1311 + ... + 14203.

It is an arithmetic number, because the mean of its divisors is an integer number (25007913).

Almost surely, 2^100011001 is an apocalyptic number.

It is an amenable number.

100011001 is a deficient number, since it is larger than the sum of its proper divisors (20651).

100011001 is an equidigital number, since it uses as much as digits as its factorization.

100011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20650.

The product of its (nonzero) digits is 1, while the sum is 4.

The square root of 100011001 is about 10000.5500348731. The cubic root of 100011001 is about 464.1759034434.

Adding to 100011001 its reverse (100110001), we get a palindrome (200121002).

It can be divided in two parts, 10001 and 1001, that multiplied together give a palindrome (10011001).

The spelling of 100011001 in words is "one hundred million, eleven thousand, one".