100155 has 16 divisors (see below), whose sum is σ = 175104. Its totient is φ = 48480.

The previous prime is 100153. The next prime is 100169. The reversal of 100155 is 551001.

It is not a de Polignac number, because 100155 - 2¹ = 100153 is a prime.

100155 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 100155.

It is not an unprimeable number, because it can be changed into a prime (100151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139 + ... + 468.

It is an arithmetic number, because the mean of its divisors is an integer number (10944).

2¹⁰⁰¹⁵⁵ is an apocalyptic number.

100155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100155 is a deficient number, since it is larger than the sum of its proper divisors (74949).

100155 is a wasteful number, since it uses less digits than its factorization.

100155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626.

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 100155 is about 316.4727476419. The cubic root of 100155 is about 46.4398574986.

Adding to 100155 its reverse (551001), we get a palindrome (651156).

It can be divided in two parts, 1001 and 55, that multiplied together give a palindrome (55055).

The spelling of 100155 in words is "one hundred thousand, one hundred fifty-five".