866197 has 2 divisors, whose sum is σ = 866198. Its totient is φ = 866196.

The previous prime is 866183. The next prime is 866213. The reversal of 866197 is 791668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 848241 + 17956 = 921^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 866197 - 2¹⁵ = 833429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433098 + 433099.

It is an arithmetic number, because the mean of its divisors is an integer number (433099).

2⁸⁶⁶¹⁹⁷ is an apocalyptic number.

It is an amenable number.

866197 is a deficient number, since it is larger than the sum of its proper divisors (1).

866197 is an equidigital number, since it uses as much as digits as its factorization.

866197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 866197 is about 930.6970506024. The cubic root of 866197 is about 95.3247244197.

Subtracting from 866197 its reverse (791668), we obtain a square (74529 = 273²).

The spelling of 866197 in words is "eight hundred sixty-six thousand, one hundred ninety-seven".