56215 has 4 divisors (see below), whose sum is σ = 67464.
Its totient is φ = 44968.
The previous prime is 56209. The next prime is 56237. The reversal of 56215 is 51265.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51265 = 5 ⋅10253.
It is a cyclic number.
It is not a de Polignac number, because 56215 - 23 = 56207 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a nialpdrome in base 16.
It is a junction number, because it is equal to n+sod(n) for n = 56192 and 56201.
It is a congruent number.
It is an unprimeable number.
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 in 3 ways as a sum of consecutive naturals, for example, 5617 + ... + 5626.
It is an arithmetic number, because the mean of its divisors is an integer number (16866).
256215 is an apocalyptic number.
56215 is a deficient number, since it is larger than the sum of its proper divisors (11249).
56215 is a wasteful number, since it uses less digits than its factorization.
56215 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11248.
The product of its digits is 300, while the sum is 19.
The square root of 56215 is about 237.0970265524.
The cubic root of 56215 is about 38.3075230582.
Subtracting from 56215 its reverse (51265), we obtain a triangular number (4950 = T99).
The spelling of 56215 in words is "fifty-six thousand, two hundred fifteen".