420544009 has 2 divisors, whose sum is σ = 420544010. Its totient is φ = 420544008.

The previous prime is 420543997. The next prime is 420544013. The reversal of 420544009 is 900445024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350737984 + 69806025 = 18728^2 + 8355^2 .

It is a cyclic number.

It is not a de Polignac number, because 420544009 - 2¹⁵ = 420511241 is a prime.

It is not a weakly prime, because it can be changed into another prime (420544039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210272004 + 210272005.

It is an arithmetic number, because the mean of its divisors is an integer number (210272005).

Almost surely, 2^420544009 is an apocalyptic number.

It is an amenable number.

420544009 is a deficient number, since it is larger than the sum of its proper divisors (1).

420544009 is an equidigital number, since it uses as much as digits as its factorization.

420544009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 420544009 is about 20507.1696974497. The cubic root of 420544009 is about 749.2104336643.

The spelling of 420544009 in words is "four hundred twenty million, five hundred forty-four thousand, nine".