55100 has 36 divisors (see below), whose sum is σ = 130200. Its totient is φ = 20160.

The previous prime is 55079. The next prime is 55103. The reversal of 55100 is 155.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55103) by changing a digit.

55100 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1886 + ... + 1914.

2⁵⁵¹⁰⁰ is an apocalyptic number.

55100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65100).

55100 is an abundant number, since it is smaller than the sum of its proper divisors (75100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55100 is a wasteful number, since it uses less digits than its factorization.

55100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 11.

The square root of 55100 is about 234.7338918861. The cubic root of 55100 is about 38.0525588498.

Adding to 55100 its reverse (155), we get a palindrome (55255).

Subtracting from 55100 its reverse (155), we obtain a palindrome (54945).

The spelling of 55100 in words is "fifty-five thousand, one hundred".