100001209 has 12 divisors (see below), whose sum is σ = 126903888. Its totient is φ = 77922600.

The previous prime is 100001207. The next prime is 100001219. The reversal of 100001209 is 902100001.

It is not a de Polignac number, because 100001209 - 2¹ = 100001207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100001203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92227 + ... + 93304.

It is an arithmetic number, because the mean of its divisors is an integer number (10575324).

Almost surely, 2^100001209 is an apocalyptic number.

It is an amenable number.

100001209 is a deficient number, since it is larger than the sum of its proper divisors (26902679).

100001209 is a wasteful number, since it uses less digits than its factorization.

100001209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185556 (or 185549 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 100001209 is about 10000.0604498173. The cubic root of 100001209 is about 464.1607539140.

The spelling of 100001209 in words is "one hundred million, one thousand, two hundred nine".