217397 has 2 divisors, whose sum is σ = 217398. Its totient is φ = 217396.

The previous prime is 217387. The next prime is 217409. The reversal of 217397 is 793712.

It is a happy number.

217397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 64516 = 391^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 217397 - 2⁶ = 217333 is a prime.

It is a super-2 number, since 2×217397² = 94522911218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108698 + 108699.

It is an arithmetic number, because the mean of its divisors is an integer number (108699).

2²¹⁷³⁹⁷ is an apocalyptic number.

It is an amenable number.

217397 is a deficient number, since it is larger than the sum of its proper divisors (1).

217397 is an equidigital number, since it uses as much as digits as its factorization.

217397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646, while the sum is 29.

The square root of 217397 is about 466.2585119866. The cubic root of 217397 is about 60.1290739845.

The spelling of 217397 in words is "two hundred seventeen thousand, three hundred ninety-seven".