42016109 has 2 divisors, whose sum is σ = 42016110. Its totient is φ = 42016108.

The previous prime is 42016097. The next prime is 42016151. The reversal of 42016109 is 90161024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29214025 + 12802084 = 5405^2 + 3578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42016109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42016199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21008054 + 21008055.

It is an arithmetic number, because the mean of its divisors is an integer number (21008055).

Almost surely, 2^42016109 is an apocalyptic number.

It is an amenable number.

42016109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42016109 is an equidigital number, since it uses as much as digits as its factorization.

42016109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 42016109 is about 6481.9834155912. The cubic root of 42016109 is about 347.6470995329.

The spelling of 42016109 in words is "forty-two million, sixteen thousand, one hundred nine".