56209 has 2 divisors, whose sum is σ = 56210. Its totient is φ = 56208.
The previous prime is 56207. The next prime is 56237. The reversal of 56209 is 90265.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 51984 + 4225 = 228^2 + 65^2 .
It is a cyclic number.
It is not a de Polignac number, because 56209 - 21 = 56207 is a prime.
Together with 56207, it forms a pair of twin primes.
56209 is a lucky number.
It is a plaindrome in base 14.
It is a nialpdrome in base 16.
It is a self number, because there is not a number n which added to its sum of digits gives 56209.
It is not a weakly prime, because it can be changed into another prime (56207) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28104 + 28105.
It is an arithmetic number, because the mean of its divisors is an integer number (28105).
256209 is an apocalyptic number.
It is an amenable number.
56209 is a deficient number, since it is larger than the sum of its proper divisors (1).
56209 is an equidigital number, since it uses as much as digits as its factorization.
56209 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 540, while the sum is 22.
The square root of 56209 is about 237.0843731670. The cubic root of 56209 is about 38.3061601164.
The spelling of 56209 in words is "fifty-six thousand, two hundred nine".
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