561039 has 16 divisors (see below), whose sum is σ = 801792. Its totient is φ = 348128.

The previous prime is 561019. The next prime is 561047. The reversal of 561039 is 930165.

It is not a de Polignac number, because 561039 - 2⁸ = 560783 is a prime.

561039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561019) 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 15 ways as a sum of consecutive naturals, for example, 3157 + ... + 3329.

It is an arithmetic number, because the mean of its divisors is an integer number (50112).

2⁵⁶¹⁰³⁹ is an apocalyptic number.

561039 is a deficient number, since it is larger than the sum of its proper divisors (240753).

561039 is a wasteful number, since it uses less digits than its factorization.

561039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 561039 is about 749.0253667267. The cubic root of 561039 is about 82.4766508763.

The spelling of 561039 in words is "five hundred sixty-one thousand, thirty-nine".