561003 has 8 divisors (see below), whose sum is σ = 766416. Its totient is φ = 364800.

The previous prime is 560977. The next prime is 561019. The reversal of 561003 is 300165.

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

It is not a de Polignac number, because 561003 - 2⁶ = 560939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2158 + ... + 2403.

It is an arithmetic number, because the mean of its divisors is an integer number (95802).

2⁵⁶¹⁰⁰³ is an apocalyptic number.

561003 is a deficient number, since it is larger than the sum of its proper divisors (205413).

561003 is a wasteful number, since it uses less digits than its factorization.

561003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 561003 is about 749.0013351123. The cubic root of 561003 is about 82.4748867548.

Adding to 561003 its reverse (300165), we get a palindrome (861168).

The spelling of 561003 in words is "five hundred sixty-one thousand, three".