30818209 has 6 divisors (see below), whose sum is σ = 32525970. Its totient is φ = 29195856.

The previous prime is 30818197. The next prime is 30818233. The reversal of 30818209 is 90281803.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 14440000 = 4047^2 + 3800^2 .

It is not a de Polignac number, because 30818209 - 2⁹ = 30817697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30818269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42324 + ... + 43045.

It is an arithmetic number, because the mean of its divisors is an integer number (5420995).

Almost surely, 2^30818209 is an apocalyptic number.

It is an amenable number.

30818209 is a deficient number, since it is larger than the sum of its proper divisors (1707761).

30818209 is an equidigital number, since it uses as much as digits as its factorization.

30818209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85407 (or 85388 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 30818209 is about 5551.4150448332. The cubic root of 30818209 is about 313.5228021370.

The spelling of 30818209 in words is "thirty million, eight hundred eighteen thousand, two hundred nine".