42209441 has 2 divisors, whose sum is σ = 42209442. Its totient is φ = 42209440.

The previous prime is 42209389. The next prime is 42209449. The reversal of 42209441 is 14490224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37258816 + 4950625 = 6104^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 42209441 - 2¹⁰ = 42208417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42209441.

It is not a weakly prime, because it can be changed into another prime (42209449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104720 + 21104721.

It is an arithmetic number, because the mean of its divisors is an integer number (21104721).

Almost surely, 2^42209441 is an apocalyptic number.

It is an amenable number.

42209441 is a deficient number, since it is larger than the sum of its proper divisors (1).

42209441 is an equidigital number, since it uses as much as digits as its factorization.

42209441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 42209441 is about 6496.8793278004. The cubic root of 42209441 is about 348.1795023434.

Adding to 42209441 its reverse (14490224), we get a palindrome (56699665).

The spelling of 42209441 in words is "forty-two million, two hundred nine thousand, four hundred forty-one".