561425021 has 2 divisors, whose sum is σ = 561425022. Its totient is φ = 561425020.

The previous prime is 561424993. The next prime is 561425057. The reversal of 561425021 is 120524165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371949796 + 189475225 = 19286^2 + 13765^2 .

It is a cyclic number.

It is not a de Polignac number, because 561425021 - 2²² = 557230717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561422021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280712510 + 280712511.

It is an arithmetic number, because the mean of its divisors is an integer number (280712511).

Almost surely, 2^561425021 is an apocalyptic number.

It is an amenable number.

561425021 is a deficient number, since it is larger than the sum of its proper divisors (1).

561425021 is an equidigital number, since it uses as much as digits as its factorization.

561425021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 561425021 is about 23694.4090662755. The cubic root of 561425021 is about 824.9556246716.

Adding to 561425021 its reverse (120524165), we get a palindrome (681949186).

The spelling of 561425021 in words is "five hundred sixty-one million, four hundred twenty-five thousand, twenty-one".