100000009 has 4 divisors (see below), whose sum is σ = 100671300. Its totient is φ = 99328720.

The previous prime is 100000007. The next prime is 100000037. The reversal of 100000009 is 900000001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900000001 = 409 ⋅2200489.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 88303609 = 3420^2 + 9397^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000009 - 2¹ = 100000007 is a prime.

It is a Duffinian number.

100000009 is a modest number, since divided by 9 gives 1 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 99999950 and 100000004.

It is not an unprimeable number, because it can be changed into a prime (100000007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335422 + ... + 335719.

It is an arithmetic number, because the mean of its divisors is an integer number (25167825).

Almost surely, 2^100000009 is an apocalyptic number.

It is an amenable number.

100000009 is a deficient number, since it is larger than the sum of its proper divisors (671291).

100000009 is an equidigital number, since it uses as much as digits as its factorization.

100000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671290.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 100000009 is about 10000.0004500000. Note that the first 3 decimals coincide. The cubic root of 100000009 is about 464.1588972860.

Subtracting from 100000009 its sum of digits (10), we obtain a palindrome (99999999).

The spelling of 100000009 in words is "one hundred million, nine", and thus it is an aban number.