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216955 = 543391
BaseRepresentation
bin110100111101111011
3102000121101
4310331323
523420310
64352231
71562344
oct647573
9360541
10216955
11139002
12a5677
137799b
14590cb
154443a
hex34f7b

216955 has 4 divisors (see below), whose sum is σ = 260352. Its totient is φ = 173560.

The previous prime is 216947. The next prime is 216967. The reversal of 216955 is 559612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 216955 - 23 = 216947 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21691 + ... + 21700.

It is an arithmetic number, because the mean of its divisors is an integer number (65088).

2216955 is an apocalyptic number.

216955 is a deficient number, since it is larger than the sum of its proper divisors (43397).

216955 is an equidigital number, since it uses as much as digits as its factorization.

216955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43396.

The product of its digits is 2700, while the sum is 28.

The square root of 216955 is about 465.7842848358. The cubic root of 216955 is about 60.0882959260.

The spelling of 216955 in words is "two hundred sixteen thousand, nine hundred fifty-five".

Divisors: 1 5 43391 216955