42205609 has 2 divisors, whose sum is σ = 42205610. Its totient is φ = 42205608.

The previous prime is 42205571. The next prime is 42205627. The reversal of 42205609 is 90650224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23474025 + 18731584 = 4845^2 + 4328^2 .

It is a cyclic number.

It is not a de Polignac number, because 42205609 - 2⁷ = 42205481 is a prime.

It is not a weakly prime, because it can be changed into another prime (42205309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21102804 + 21102805.

It is an arithmetic number, because the mean of its divisors is an integer number (21102805).

Almost surely, 2^42205609 is an apocalyptic number.

It is an amenable number.

42205609 is a deficient number, since it is larger than the sum of its proper divisors (1).

42205609 is an equidigital number, since it uses as much as digits as its factorization.

42205609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 42205609 is about 6496.5844102882. The cubic root of 42205609 is about 348.1689654888.

The spelling of 42205609 in words is "forty-two million, two hundred five thousand, six hundred nine".