100909109 has 4 divisors (see below), whose sum is σ = 115324704. Its totient is φ = 86493516.

The previous prime is 100909103. The next prime is 100909111. The reversal of 100909109 is 901909001.

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 a cyclic number.

It is not a de Polignac number, because 100909109 - 2²⁴ = 84131893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100909103) 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, 7207787 + ... + 7207800.

It is an arithmetic number, because the mean of its divisors is an integer number (28831176).

Almost surely, 2^100909109 is an apocalyptic number.

It is an amenable number.

100909109 is a deficient number, since it is larger than the sum of its proper divisors (14415595).

100909109 is an equidigital number, since it uses as much as digits as its factorization.

100909109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14415594.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 100909109 is about 10045.3526070517. The cubic root of 100909109 is about 465.5612124021.

The spelling of 100909109 in words is "one hundred million, nine hundred nine thousand, one hundred nine".