561303 has 8 divisors (see below), whose sum is σ = 831600. Its totient is φ = 374184.

The previous prime is 561277. The next prime is 561307. The reversal of 561303 is 303165.

It is not a de Polignac number, because 561303 - 2⁸ = 561047 is a prime.

It is a super-2 number, since 2×561303² = 630122115618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561307) 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, 10368 + ... + 10421.

It is an arithmetic number, because the mean of its divisors is an integer number (103950).

2⁵⁶¹³⁰³ is an apocalyptic number.

561303 is a deficient number, since it is larger than the sum of its proper divisors (270297).

561303 is a wasteful number, since it uses less digits than its factorization.

561303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20798 (or 20792 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 561303 is about 749.2015750117. The cubic root of 561303 is about 82.4895854622.

Adding to 561303 its reverse (303165), we get a palindrome (864468).

The spelling of 561303 in words is "five hundred sixty-one thousand, three hundred three".