551530 has 16 divisors (see below), whose sum is σ = 1134720. Its totient is φ = 189072.

The previous prime is 551519. The next prime is 551539. The reversal of 551530 is 35155.

551530 = T₇₀ + T₇₁ + ... + T₁₅₃.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 551498 and 551507.

It is not an unprimeable number, because it can be changed into a prime (551539) by changing a digit.

551530 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 7 ways as a sum of consecutive naturals, for example, 3870 + ... + 4009.

It is an arithmetic number, because the mean of its divisors is an integer number (70920).

2⁵⁵¹⁵³⁰ is an apocalyptic number.

551530 is an abundant number, since it is smaller than the sum of its proper divisors (583190).

It is a weird number, because it is abundant, but not a pseudoperfect number.

551530 is a wasteful number, since it uses less digits than its factorization.

551530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893.

The product of its (nonzero) digits is 375, while the sum is 19.

The square root of 551530 is about 742.6506581159. The cubic root of 551530 is about 82.0080301476.

Subtracting from 551530 its product of nonzero digits (375), we obtain a palindrome (551155).

Adding to 551530 its reverse (35155), we get a palindrome (586685).

It can be divided in two parts, 551 and 530, that added together give a triangular number (1081 = T₄₆).

The spelling of 551530 in words is "five hundred fifty-one thousand, five hundred thirty".