217079 has 4 divisors (see below), whose sum is σ = 222984. Its totient is φ = 211176.

The previous prime is 217069. The next prime is 217081. The reversal of 217079 is 970712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217079 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2897 + ... + 2970.

It is an arithmetic number, because the mean of its divisors is an integer number (55746).

2²¹⁷⁰⁷⁹ is an apocalyptic number.

217079 is a deficient number, since it is larger than the sum of its proper divisors (5905).

217079 is an equidigital number, since it uses as much as digits as its factorization.

217079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5904.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 217079 is about 465.9173746492. The cubic root of 217079 is about 60.0997415094.

The spelling of 217079 in words is "two hundred seventeen thousand, seventy-nine".