42240109 has 2 divisors, whose sum is σ = 42240110. Its totient is φ = 42240108.

The previous prime is 42240103. The next prime is 42240131. The reversal of 42240109 is 90104224.

It is an a-pointer prime, because the next prime (42240131) can be obtained adding 42240109 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41964484 + 275625 = 6478^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240109 - 2⁹ = 42239597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42240109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42240103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120054 + 21120055.

It is an arithmetic number, because the mean of its divisors is an integer number (21120055).

Almost surely, 2^42240109 is an apocalyptic number.

It is an amenable number.

42240109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240109 is an equidigital number, since it uses as much as digits as its factorization.

42240109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 42240109 is about 6499.2391093112. The cubic root of 42240109 is about 348.2638072105.

The spelling of 42240109 in words is "forty-two million, two hundred forty thousand, one hundred nine".