56009 has 2 divisors, whose sum is σ = 56010.
Its totient is φ = 56008.
The previous prime is 56003. The next prime is 56039. The reversal of 56009 is 90065.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 55225 + 784 = 235^2 + 28^2
It is a cyclic number.
It is not a de Polignac number, because 56009 - 212 = 51913 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a Curzon number.
It is a plaindrome in base 6 and base 15.
It is not a weakly prime, because it can be changed into another prime (56003) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28004 + 28005.
It is an arithmetic number, because the mean of its divisors is an integer number (28005).
256009 is an apocalyptic number.
It is an amenable number.
56009 is a deficient number, since it is larger than the sum of its proper divisors (1).
56009 is an equidigital number, since it uses as much as digits as its factorization.
56009 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 270, while the sum is 20.
The square root of 56009 is about 236.6622065307.
The cubic root of 56009 is about 38.2606731148.
The spelling of 56009 in words is "fifty-six thousand, nine".