100855 has 8 divisors (see below), whose sum is σ = 126432. Its totient is φ = 77088.

The previous prime is 100853. The next prime is 100907. The reversal of 100855 is 558001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100855 - 2¹ = 100853 is a prime.

It is a Duffinian number.

100855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100853) 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 7 ways as a sum of consecutive naturals, for example, 324 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (15804).

2¹⁰⁰⁸⁵⁵ is an apocalyptic number.

100855 is a deficient number, since it is larger than the sum of its proper divisors (25577).

100855 is an equidigital number, since it uses as much as digits as its factorization.

100855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 100855 is about 317.5767623741. The cubic root of 100855 is about 46.5477983855.

Adding to 100855 its reverse (558001), we get a palindrome (658856).

The spelling of 100855 in words is "one hundred thousand, eight hundred fifty-five".