561845 has 8 divisors (see below), whose sum is σ = 692664. Its totient is φ = 437184.

The previous prime is 561839. The next prime is 561907. The reversal of 561845 is 548165.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 256036 + 305809 = 506^2 + 553^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 561845 - 2⁴ = 561829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561845.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1334 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (86583).

2⁵⁶¹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

561845 is a deficient number, since it is larger than the sum of its proper divisors (130819).

561845 is a wasteful number, since it uses less digits than its factorization.

561845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079.

The product of its digits is 4800, while the sum is 29.

The square root of 561845 is about 749.5632061407. The cubic root of 561845 is about 82.5161278540.

The spelling of 561845 in words is "five hundred sixty-one thousand, eight hundred forty-five".