216471 has 8 divisors (see below), whose sum is σ = 293760. Its totient is φ = 141752.

The previous prime is 216451. The next prime is 216481. The reversal of 216471 is 174612.

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

It is a cyclic number.

It is not a de Polignac number, because 216471 - 2⁹ = 215959 is a prime.

It is a super-3 number, since 3×216471³ = 30431294356365333, which contains 333 as substring.

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216471.

It is not an unprimeable number, because it can be changed into a prime (216401) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 435 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (36720).

2²¹⁶⁴⁷¹ is an apocalyptic number.

216471 is a deficient number, since it is larger than the sum of its proper divisors (77289).

216471 is a wasteful number, since it uses less digits than its factorization.

216471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285.

The product of its digits is 336, while the sum is 21.

The square root of 216471 is about 465.2644409365. The cubic root of 216471 is about 60.0435794506.

The spelling of 216471 in words is "two hundred sixteen thousand, four hundred seventy-one".