551100 has 72 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 132800.

The previous prime is 551099. The next prime is 551107. The reversal of 551100 is 1155.

It is a super-2 number, since 2×551100² = 607422420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3217 + ... + 3383.

It is an arithmetic number, because the mean of its divisors is an integer number (24304).

2⁵⁵¹¹⁰⁰ is an apocalyptic number.

551100 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 551100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874944).

551100 is an abundant number, since it is smaller than the sum of its proper divisors (1198788).

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

551100 is a wasteful number, since it uses less digits than its factorization.

551100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 188 counting only the distinct ones).

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

The square root of 551100 is about 742.3610981187. The cubic root of 551100 is about 81.9867121042.

Adding to 551100 its reverse (1155), we get a palindrome (552255).

Subtracting from 551100 its reverse (1155), we obtain a palindrome (549945).

The spelling of 551100 in words is "five hundred fifty-one thousand, one hundred".