561421 has 8 divisors (see below), whose sum is σ = 647360. Its totient is φ = 476928.

The previous prime is 561419. The next prime is 561439. The reversal of 561421 is 124165.

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 561421 - 2¹ = 561419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561461) 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 7 ways as a sum of consecutive naturals, for example, 685 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (80920).

2⁵⁶¹⁴²¹ is an apocalyptic number.

It is an amenable number.

561421 is a deficient number, since it is larger than the sum of its proper divisors (85939).

561421 is a wasteful number, since it uses less digits than its factorization.

561421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723.

The product of its digits is 240, while the sum is 19.

The square root of 561421 is about 749.2803213751. The cubic root of 561421 is about 82.4953655187.

Adding to 561421 its reverse (124165), we get a palindrome (685586).

The spelling of 561421 in words is "five hundred sixty-one thousand, four hundred twenty-one".