217144 has 8 divisors (see below), whose sum is σ = 407160. Its totient is φ = 108568.

The previous prime is 217121. The next prime is 217157. The reversal of 217144 is 441712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564 + ... + 13579.

It is an arithmetic number, because the mean of its divisors is an integer number (50895).

2²¹⁷¹⁴⁴ is an apocalyptic number.

It is an amenable number.

217144 is a deficient number, since it is larger than the sum of its proper divisors (190016).

217144 is a wasteful number, since it uses less digits than its factorization.

217144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27149 (or 27145 counting only the distinct ones).

The product of its digits is 224, while the sum is 19.

The square root of 217144 is about 465.9871242856. The cubic root of 217144 is about 60.1057394692.

Adding to 217144 its reverse (441712), we get a palindrome (658856).

It can be divided in two parts, 217 and 144, that added together give a square (361 = 19²).

The spelling of 217144 in words is "two hundred seventeen thousand, one hundred forty-four", and thus it is an iban number.