42490109 has 2 divisors, whose sum is σ = 42490110. Its totient is φ = 42490108.

The previous prime is 42490103. The next prime is 42490111. The reversal of 42490109 is 90109424.

42490109 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 can be written as a sum of positive squares in only one way, i.e., 41964484 + 525625 = 6478^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 42490109 - 2⁴ = 42490093 is a prime.

It is a Sophie Germain prime.

Together with 42490111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42490103) 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, 21245054 + 21245055.

It is an arithmetic number, because the mean of its divisors is an integer number (21245055).

Almost surely, 2^42490109 is an apocalyptic number.

It is an amenable number.

42490109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42490109 is an equidigital number, since it uses as much as digits as its factorization.

42490109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 42490109 is about 6518.4437559896. The cubic root of 42490109 is about 348.9495278719.

The spelling of 42490109 in words is "forty-two million, four hundred ninety thousand, one hundred nine".