42809219 has 2 divisors, whose sum is σ = 42809220. Its totient is φ = 42809218.

The previous prime is 42809203. The next prime is 42809227. The reversal of 42809219 is 91290824.

42809219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42809219 - 2⁴ = 42809203 is a prime.

It is a super-2 number, since 2×42809219² = 3665258462779922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42809269) 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, 21404609 + 21404610.

It is an arithmetic number, because the mean of its divisors is an integer number (21404610).

Almost surely, 2^42809219 is an apocalyptic number.

42809219 is a deficient number, since it is larger than the sum of its proper divisors (1).

42809219 is an equidigital number, since it uses as much as digits as its factorization.

42809219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 42809219 is about 6542.8754382152. The cubic root of 42809219 is about 349.8209124620.

The spelling of 42809219 in words is "forty-two million, eight hundred nine thousand, two hundred nineteen".