42110209 has 2 divisors, whose sum is σ = 42110210. Its totient is φ = 42110208.

The previous prime is 42110161. The next prime is 42110227. The reversal of 42110209 is 90201124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 2772225 = 6272^2 + 1665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42110209 is a prime.

It is not a weakly prime, because it can be changed into another prime (42110609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21055104 + 21055105.

It is an arithmetic number, because the mean of its divisors is an integer number (21055105).

Almost surely, 2^42110209 is an apocalyptic number.

It is an amenable number.

42110209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42110209 is an equidigital number, since it uses as much as digits as its factorization.

42110209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 42110209 is about 6489.2379367688. The cubic root of 42110209 is about 347.9064381629.

The spelling of 42110209 in words is "forty-two million, one hundred ten thousand, two hundred nine".