561449 has 4 divisors (see below), whose sum is σ = 641664. Its totient is φ = 481236.

The previous prime is 561439. The next prime is 561461. The reversal of 561449 is 944165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 944165 = 5 ⋅188833.

It is a de Polignac number, because none of the positive numbers 2^k-561449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561409) by changing a digit.

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, 40097 + ... + 40110.

It is an arithmetic number, because the mean of its divisors is an integer number (160416).

2⁵⁶¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

561449 is a deficient number, since it is larger than the sum of its proper divisors (80215).

561449 is an equidigital number, since it uses as much as digits as its factorization.

561449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80214.

The product of its digits is 4320, while the sum is 29.

The square root of 561449 is about 749.2990057380. The cubic root of 561449 is about 82.4967369386.

The spelling of 561449 in words is "five hundred sixty-one thousand, four hundred forty-nine".