30505309 has 2 divisors, whose sum is σ = 30505310. Its totient is φ = 30505308.

The previous prime is 30505249. The next prime is 30505399. The reversal of 30505309 is 90350503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 2732409 = 5270^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 30505309 - 2⁹ = 30504797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30505399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15252654 + 15252655.

It is an arithmetic number, because the mean of its divisors is an integer number (15252655).

Almost surely, 2^30505309 is an apocalyptic number.

It is an amenable number.

30505309 is a deficient number, since it is larger than the sum of its proper divisors (1).

30505309 is an equidigital number, since it uses as much as digits as its factorization.

30505309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025, while the sum is 25.

The square root of 30505309 is about 5523.1611419548. The cubic root of 30505309 is about 312.4581157732.

The spelling of 30505309 in words is "thirty million, five hundred five thousand, three hundred nine".