561785 has 12 divisors (see below), whose sum is σ = 784548. Its totient is φ = 385056.

The previous prime is 561767. The next prime is 561787. The reversal of 561785 is 587165.

It can be written as a sum of positive squares in 2 ways, for example, as 182329 + 379456 = 427^2 + 616^2 .

It is not a de Polignac number, because 561785 - 2⁸ = 561529 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561785.

It is not an unprimeable number, because it can be changed into a prime (561787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 902 + ... + 1391.

It is an arithmetic number, because the mean of its divisors is an integer number (65379).

2⁵⁶¹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

561785 is a deficient number, since it is larger than the sum of its proper divisors (222763).

561785 is a wasteful number, since it uses less digits than its factorization.

561785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2305 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 561785 is about 749.5231817629. The cubic root of 561785 is about 82.5131904223.

The spelling of 561785 in words is "five hundred sixty-one thousand, seven hundred eighty-five".