551232 has 112 divisors (see below), whose sum is σ = 1828800. Its totient is φ = 161280.

The previous prime is 551231. The next prime is 551233. The reversal of 551232 is 232155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (551231) and next prime (551233).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a d-powerful number, because it can be written as 5² + 5⁵ + 2⁸ + 1 + 3¹² + 2¹⁴ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551231) 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, 18994 + ... + 19022.

2⁵⁵¹²³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914400).

551232 is an abundant number, since it is smaller than the sum of its proper divisors (1277568).

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

551232 is a wasteful number, since it uses less digits than its factorization.

551232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 45 counting only the distinct ones).

The product of its digits is 300, while the sum is 18.

The square root of 551232 is about 742.4499983164. The cubic root of 551232 is about 81.9932574270.

Adding to 551232 its reverse (232155), we get a palindrome (783387).

The spelling of 551232 in words is "five hundred fifty-one thousand, two hundred thirty-two".