561853 has 4 divisors (see below), whose sum is σ = 572508. Its totient is φ = 551200.

The previous prime is 561839. The next prime is 561907. The reversal of 561853 is 358165.

561853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 358165 = 5 ⋅71633.

It can be written as a sum of positive squares in 2 ways, for example, as 444889 + 116964 = 667^2 + 342^2 .

It is a de Polignac number, because none of the positive numbers 2^k-561853 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5248 + ... + 5353.

It is an arithmetic number, because the mean of its divisors is an integer number (143127).

2⁵⁶¹⁸⁵³ is an apocalyptic number.

561853 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

561853 is a deficient number, since it is larger than the sum of its proper divisors (10655).

561853 is a wasteful number, since it uses less digits than its factorization.

561853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10654.

The product of its digits is 3600, while the sum is 28.

The square root of 561853 is about 749.5685425630. The cubic root of 561853 is about 82.5165194958.

It can be divided in two parts, 5618 and 53, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 561853 in words is "five hundred sixty-one thousand, eight hundred fifty-three".