561246421 has 4 divisors (see below), whose sum is σ = 570447244. Its totient is φ = 552045600.

The previous prime is 561246407. The next prime is 561246463. The reversal of 561246421 is 124642165.

It is a happy number.

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 95765796 + 465480625 = 9786^2 + 21575^2 .

It is a cyclic number.

It is not a de Polignac number, because 561246421 - 2⁷ = 561246293 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 (561246221) 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, 4600320 + ... + 4600441.

It is an arithmetic number, because the mean of its divisors is an integer number (142611811).

Almost surely, 2^561246421 is an apocalyptic number.

It is an amenable number.

561246421 is a deficient number, since it is larger than the sum of its proper divisors (9200823).

561246421 is an equidigital number, since it uses as much as digits as its factorization.

561246421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9200822.

The product of its digits is 11520, while the sum is 31.

The square root of 561246421 is about 23690.6399449234. The cubic root of 561246421 is about 824.8681373579.

Adding to 561246421 its reverse (124642165), we get a palindrome (685888586).

The spelling of 561246421 in words is "five hundred sixty-one million, two hundred forty-six thousand, four hundred twenty-one".