172217 has 2 divisors, whose sum is σ = 172218. Its totient is φ = 172216.

The previous prime is 172213. The next prime is 172219. The reversal of 172217 is 712271.

172217 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99856 + 72361 = 316^2 + 269^2 .

It is a cyclic number.

It is not a de Polignac number, because 172217 - 2² = 172213 is a prime.

Together with 172219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86108 + 86109.

It is an arithmetic number, because the mean of its divisors is an integer number (86109).

2¹⁷²²¹⁷ is an apocalyptic number.

It is an amenable number.

172217 is a deficient number, since it is larger than the sum of its proper divisors (1).

172217 is an equidigital number, since it uses as much as digits as its factorization.

172217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196, while the sum is 20.

The square root of 172217 is about 414.9903613339. The cubic root of 172217 is about 55.6363554648.

Adding to 172217 its reverse (712271), we get a palindrome (884488).

The spelling of 172217 in words is "one hundred seventy-two thousand, two hundred seventeen", and thus it is an iban number.