216554 has 8 divisors (see below), whose sum is σ = 349860. Its totient is φ = 99936.

The previous prime is 216553. The next prime is 216569. The reversal of 216554 is 455612.

It can be written as a sum of positive squares in 2 ways, for example, as 182329 + 34225 = 427^2 + 185^2 .

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

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216554.

It is not an unprimeable number, because it can be changed into a prime (216551) 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 3 ways as a sum of consecutive naturals, for example, 4139 + ... + 4190.

2²¹⁶⁵⁵⁴ is an apocalyptic number.

216554 is a deficient number, since it is larger than the sum of its proper divisors (133306).

216554 is a wasteful number, since it uses less digits than its factorization.

216554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8344.

The product of its digits is 1200, while the sum is 23.

The square root of 216554 is about 465.3536289748. The cubic root of 216554 is about 60.0512525035.

The spelling of 216554 in words is "two hundred sixteen thousand, five hundred fifty-four".