100909115 has 4 divisors (see below), whose sum is σ = 121090944. Its totient is φ = 80727288.

The previous prime is 100909111. The next prime is 100909117. The reversal of 100909115 is 511909001.

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: 511909001 = 19 ⋅26942579.

It is a cyclic number.

It is not a de Polignac number, because 100909115 - 2² = 100909111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100909111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10090907 + ... + 10090916.

It is an arithmetic number, because the mean of its divisors is an integer number (30272736).

Almost surely, 2^100909115 is an apocalyptic number.

100909115 is a deficient number, since it is larger than the sum of its proper divisors (20181829).

100909115 is an equidigital number, since it uses as much as digits as its factorization.

100909115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20181828.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 100909115 is about 10045.3529056972. The cubic root of 100909115 is about 465.5612216294.

The spelling of 100909115 in words is "one hundred million, nine hundred nine thousand, one hundred fifteen".