56018309 has 2 divisors, whose sum is σ = 56018310. Its totient is φ = 56018308.

The previous prime is 56018299. The next prime is 56018311. The reversal of 56018309 is 90381065.

56018309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38167684 + 17850625 = 6178^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 56018309 - 2¹⁶ = 55952773 is a prime.

It is a Sophie Germain prime.

Together with 56018311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56018359) 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, 28009154 + 28009155.

It is an arithmetic number, because the mean of its divisors is an integer number (28009155).

Almost surely, 2^56018309 is an apocalyptic number.

It is an amenable number.

56018309 is a deficient number, since it is larger than the sum of its proper divisors (1).

56018309 is an equidigital number, since it uses as much as digits as its factorization.

56018309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 56018309 is about 7484.5379950936. The cubic root of 56018309 is about 382.6279270792.

The spelling of 56018309 in words is "fifty-six million, eighteen thousand, three hundred nine".