11818309 has 2 divisors, whose sum is σ = 11818310. Its totient is φ = 11818308.

The previous prime is 11818307. The next prime is 11818327. The reversal of 11818309 is 90381811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9941409 + 1876900 = 3153^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 11818309 - 2¹ = 11818307 is a prime.

Together with 11818307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11818307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5909154 + 5909155.

It is an arithmetic number, because the mean of its divisors is an integer number (5909155).

Almost surely, 2^11818309 is an apocalyptic number.

It is an amenable number.

11818309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11818309 is an equidigital number, since it uses as much as digits as its factorization.

11818309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 11818309 is about 3437.7767524957. The cubic root of 11818309 is about 227.7814991438.

The spelling of 11818309 in words is "eleven million, eight hundred eighteen thousand, three hundred nine".