30845209 has 2 divisors, whose sum is σ = 30845210. Its totient is φ = 30845208.

The previous prime is 30845203. The next prime is 30845219. The reversal of 30845209 is 90254803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24950025 + 5895184 = 4995^2 + 2428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30845209 is a prime.

It is not a weakly prime, because it can be changed into another prime (30845203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15422604 + 15422605.

It is an arithmetic number, because the mean of its divisors is an integer number (15422605).

Almost surely, 2^30845209 is an apocalyptic number.

It is an amenable number.

30845209 is a deficient number, since it is larger than the sum of its proper divisors (1).

30845209 is an equidigital number, since it uses as much as digits as its factorization.

30845209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 30845209 is about 5553.8463248455. The cubic root of 30845209 is about 313.6143350870.

The spelling of 30845209 in words is "thirty million, eight hundred forty-five thousand, two hundred nine".