551730 has 32 divisors (see below), whose sum is σ = 1353024. Its totient is φ = 143936.

The previous prime is 551729. The next prime is 551731. The reversal of 551730 is 37155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (551729) and next prime (551731).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 551697 and 551706.

It is not an unprimeable number, because it can be changed into a prime (551731) 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, 1417 + ... + 1763.

It is an arithmetic number, because the mean of its divisors is an integer number (42282).

2⁵⁵¹⁷³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (676512).

551730 is an abundant number, since it is smaller than the sum of its proper divisors (801294).

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

551730 is a wasteful number, since it uses less digits than its factorization.

551730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410.

The product of its (nonzero) digits is 525, while the sum is 21.

The square root of 551730 is about 742.7852987237. The cubic root of 551730 is about 82.0179417413.

Adding to 551730 its product of nonzero digits (525), we get a palindrome (552255).

Adding to 551730 its reverse (37155), we get a palindrome (588885).

The spelling of 551730 in words is "five hundred fifty-one thousand, seven hundred thirty".