217319 has 2 divisors, whose sum is σ = 217320. Its totient is φ = 217318.

The previous prime is 217313. The next prime is 217333. The reversal of 217319 is 913712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217319 - 2¹² = 213223 is a prime.

It is a super-2 number, since 2×217319² = 94455095522, which contains 22 as substring.

It is a plaindrome in base 13 and base 15.

It is a zygodrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 217294 and 217303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108659 + 108660.

It is an arithmetic number, because the mean of its divisors is an integer number (108660).

2²¹⁷³¹⁹ is an apocalyptic number.

217319 is a deficient number, since it is larger than the sum of its proper divisors (1).

217319 is an equidigital number, since it uses as much as digits as its factorization.

217319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 23.

The square root of 217319 is about 466.1748598970. The cubic root of 217319 is about 60.1218818755.

The spelling of 217319 in words is "two hundred seventeen thousand, three hundred nineteen".