30105209 has 2 divisors, whose sum is σ = 30105210. Its totient is φ = 30105208.

The previous prime is 30105197. The next prime is 30105307. The reversal of 30105209 is 90250103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23551609 + 6553600 = 4853^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 30105209 - 2²⁰ = 29056633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30105109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15052604 + 15052605.

It is an arithmetic number, because the mean of its divisors is an integer number (15052605).

Almost surely, 2^30105209 is an apocalyptic number.

It is an amenable number.

30105209 is a deficient number, since it is larger than the sum of its proper divisors (1).

30105209 is an equidigital number, since it uses as much as digits as its factorization.

30105209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 30105209 is about 5486.8213931201. The cubic root of 30105209 is about 311.0860588340.

The spelling of 30105209 in words is "thirty million, one hundred five thousand, two hundred nine".