561445 has 4 divisors (see below), whose sum is σ = 673740. Its totient is φ = 449152.

The previous prime is 561439. The next prime is 561461. The reversal of 561445 is 544165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 438244 + 123201 = 662^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 561445 - 2¹¹ = 559397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56140 + ... + 56149.

It is an arithmetic number, because the mean of its divisors is an integer number (168435).

2⁵⁶¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

561445 is a deficient number, since it is larger than the sum of its proper divisors (112295).

561445 is a wasteful number, since it uses less digits than its factorization.

561445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112294.

The product of its digits is 2400, while the sum is 25.

The square root of 561445 is about 749.2963365719. The cubic root of 561445 is about 82.4965410242.

The spelling of 561445 in words is "five hundred sixty-one thousand, four hundred forty-five".