42116209 has 2 divisors, whose sum is σ = 42116210. Its totient is φ = 42116208.

The previous prime is 42116189. The next prime is 42116213. The reversal of 42116209 is 90261124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34810000 + 7306209 = 5900^2 + 2703^2 .

It is a cyclic number.

It is not a de Polignac number, because 42116209 - 2¹¹ = 42114161 is a prime.

It is not a weakly prime, because it can be changed into another prime (42116219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21058104 + 21058105.

It is an arithmetic number, because the mean of its divisors is an integer number (21058105).

Almost surely, 2^42116209 is an apocalyptic number.

It is an amenable number.

42116209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42116209 is an equidigital number, since it uses as much as digits as its factorization.

42116209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 42116209 is about 6489.7002242014. The cubic root of 42116209 is about 347.9229609931.

The spelling of 42116209 in words is "forty-two million, one hundred sixteen thousand, two hundred nine".