42179209 has 2 divisors, whose sum is σ = 42179210. Its totient is φ = 42179208.

The previous prime is 42179197. The next prime is 42179219. The reversal of 42179209 is 90297124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25532809 + 16646400 = 5053^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 42179209 - 2⁵ = 42179177 is a prime.

It is not a weakly prime, because it can be changed into another prime (42179219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21089604 + 21089605.

It is an arithmetic number, because the mean of its divisors is an integer number (21089605).

Almost surely, 2^42179209 is an apocalyptic number.

It is an amenable number.

42179209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42179209 is an equidigital number, since it uses as much as digits as its factorization.

42179209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 42179209 is about 6494.5522555446. The cubic root of 42179209 is about 348.0963560414.

The spelling of 42179209 in words is "forty-two million, one hundred seventy-nine thousand, two hundred nine".