100115 has 4 divisors (see below), whose sum is σ = 120144. Its totient is φ = 80088.

The previous prime is 100109. The next prime is 100129. The reversal of 100115 is 511001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100115 - 2⁸ = 99859 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10007 + ... + 10016.

It is an arithmetic number, because the mean of its divisors is an integer number (30036).

2¹⁰⁰¹¹⁵ is an apocalyptic number.

100115 is a deficient number, since it is larger than the sum of its proper divisors (20029).

100115 is an equidigital number, since it uses as much as digits as its factorization.

100115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20028.

The product of its (nonzero) digits is 5, while the sum is 8.

The square root of 100115 is about 316.4095447359. The cubic root of 100115 is about 46.4336742771.

Adding to 100115 its reverse (511001), we get a palindrome (611116).

The spelling of 100115 in words is "one hundred thousand, one hundred fifteen".