56217 has 8 divisors (see below), whose sum is σ = 85696. Its totient is φ = 32112.

The previous prime is 56209. The next prime is 56237. The reversal of 56217 is 71265.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56217 - 2³ = 56209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 2677 = 56217 / (5 + 6 + 2 + 1 + 7).

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 56193 and 56202.

It is not an unprimeable number, because it can be changed into a prime (56207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318 + ... + 1359.

It is an arithmetic number, because the mean of its divisors is an integer number (10712).

2⁵⁶²¹⁷ is an apocalyptic number.

It is an amenable number.

56217 is a deficient number, since it is larger than the sum of its proper divisors (29479).

56217 is a wasteful number, since it uses less digits than its factorization.

56217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687.

The product of its digits is 420, while the sum is 21.

The square root of 56217 is about 237.1012441975. The cubic root of 56217 is about 38.3079773506.

The spelling of 56217 in words is "fifty-six thousand, two hundred seventeen".