561530 has 16 divisors (see below), whose sum is σ = 1019304. Its totient is φ = 222720.

The previous prime is 561529. The next prime is 561551. The reversal of 561530 is 35165.

It can be written as a sum of positive squares in 4 ways, for example, as 436921 + 124609 = 661^2 + 353^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2210 + ... + 2450.

2⁵⁶¹⁵³⁰ is an apocalyptic number.

561530 is a deficient number, since it is larger than the sum of its proper divisors (457774).

561530 is a wasteful number, since it uses less digits than its factorization.

561530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 561530 is about 749.3530543075. The cubic root of 561530 is about 82.5007040038.

Adding to 561530 its reverse (35165), we get a palindrome (596695).

The spelling of 561530 in words is "five hundred sixty-one thousand, five hundred thirty".