420916609 has 2 divisors, whose sum is σ = 420916610. Its totient is φ = 420916608.

The previous prime is 420916589. The next prime is 420916621. The reversal of 420916609 is 906619024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323460225 + 97456384 = 17985^2 + 9872^2 .

It is a cyclic number.

It is not a de Polignac number, because 420916609 - 2¹¹ = 420914561 is a prime.

It is a Chen prime.

It is equal to p_22390696 and since 420916609 and 22390696 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (420916649) 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, 210458304 + 210458305.

It is an arithmetic number, because the mean of its divisors is an integer number (210458305).

Almost surely, 2^420916609 is an apocalyptic number.

It is an amenable number.

420916609 is a deficient number, since it is larger than the sum of its proper divisors (1).

420916609 is an equidigital number, since it uses as much as digits as its factorization.

420916609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 420916609 is about 20516.2523137146. The cubic root of 420916609 is about 749.4316339815.

The spelling of 420916609 in words is "four hundred twenty million, nine hundred sixteen thousand, six hundred nine".