561803 has 6 divisors (see below), whose sum is σ = 617652. Its totient is φ = 510620.

The previous prime is 561797. The next prime is 561809. The reversal of 561803 is 308165.

It is an interprime number because it is at equal distance from previous prime (561797) and next prime (561809).

It is not a de Polignac number, because 561803 - 2⁴ = 561787 is a prime.

It is a super-2 number, since 2×561803² = 631245221618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2201 + ... + 2442.

It is an arithmetic number, because the mean of its divisors is an integer number (102942).

2⁵⁶¹⁸⁰³ is an apocalyptic number.

561803 is a deficient number, since it is larger than the sum of its proper divisors (55849).

561803 is a wasteful number, since it uses less digits than its factorization.

561803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4665 (or 4654 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 561803 is about 749.5351893007. The cubic root of 561803 is about 82.5140716738.

Adding to 561803 its reverse (308165), we get a palindrome (869968).

The spelling of 561803 in words is "five hundred sixty-one thousand, eight hundred three".