30986209 has 2 divisors, whose sum is σ = 30986210. Its totient is φ = 30986208.

The previous prime is 30986191. The next prime is 30986213. The reversal of 30986209 is 90268903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 10419984 = 4535^2 + 3228^2 .

It is a cyclic number.

It is not a de Polignac number, because 30986209 - 2²¹ = 28889057 is a prime.

It is not a weakly prime, because it can be changed into another prime (30986299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15493104 + 15493105.

It is an arithmetic number, because the mean of its divisors is an integer number (15493105).

Almost surely, 2^30986209 is an apocalyptic number.

It is an amenable number.

30986209 is a deficient number, since it is larger than the sum of its proper divisors (1).

30986209 is an equidigital number, since it uses as much as digits as its factorization.

30986209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 30986209 is about 5566.5257566996. The cubic root of 30986209 is about 314.0914746945.

The spelling of 30986209 in words is "thirty million, nine hundred eighty-six thousand, two hundred nine".