195817 has 2 divisors, whose sum is σ = 195818.
Its totient is φ = 195816.
The previous prime is 195809. The next prime is 195863. The reversal of 195817 is 718591.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 168921 + 26896 = 411^2 + 164^2
It is a cyclic number.
It is not a de Polignac number, because 195817 - 23 = 195809 is a prime.
195817 is a lucky number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (195887) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97908 + 97909.
It is an arithmetic number, because the mean of its divisors is an integer number (97909).
2195817 is an apocalyptic number.
It is an amenable number.
195817 is a deficient number, since it is larger than the sum of its proper divisors (1).
195817 is an equidigital number, since it uses as much as digits as its factorization.
195817 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2520, while the sum is 31.
The square root of 195817 is about 442.5121467259.
The cubic root of 195817 is about 58.0697733425.
The spelling of 195817 in words is "one hundred ninety-five thousand, eight hundred seventeen".