561503 has 8 divisors (see below), whose sum is σ = 591360. Its totient is φ = 532440.

The previous prime is 561461. The next prime is 561521. The reversal of 561503 is 305165.

561503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561503 - 2⁶ = 561439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676 + ... + 1982.

It is an arithmetic number, because the mean of its divisors is an integer number (73920).

2⁵⁶¹⁵⁰³ is an apocalyptic number.

561503 is a deficient number, since it is larger than the sum of its proper divisors (29857).

561503 is a wasteful number, since it uses less digits than its factorization.

561503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397.

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

The square root of 561503 is about 749.3350385508. The cubic root of 561503 is about 82.4993816911.

Adding to 561503 its reverse (305165), we get a palindrome (866668).

The spelling of 561503 in words is "five hundred sixty-one thousand, five hundred three".