561939 has 8 divisors (see below), whose sum is σ = 856320. Its totient is φ = 321096.

The previous prime is 561931. The next prime is 561943. The reversal of 561939 is 939165.

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

It is not a de Polignac number, because 561939 - 2³ = 561931 is a prime.

561939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (561931) 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, 13359 + ... + 13400.

It is an arithmetic number, because the mean of its divisors is an integer number (107040).

2⁵⁶¹⁹³⁹ is an apocalyptic number.

561939 is a deficient number, since it is larger than the sum of its proper divisors (294381).

561939 is a wasteful number, since it uses less digits than its factorization.

561939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26769.

The product of its digits is 7290, while the sum is 33.

The square root of 561939 is about 749.6259067028. The cubic root of 561939 is about 82.5207294099.

The spelling of 561939 in words is "five hundred sixty-one thousand, nine hundred thirty-nine".