195806917 has 2 divisors, whose sum is σ = 195806918. Its totient is φ = 195806916.

The previous prime is 195806893. The next prime is 195806921. The reversal of 195806917 is 719608591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188403076 + 7403841 = 13726^2 + 2721^2 .

It is a cyclic number.

It is not a de Polignac number, because 195806917 - 2¹⁵ = 195774149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195806987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97903458 + 97903459.

It is an arithmetic number, because the mean of its divisors is an integer number (97903459).

Almost surely, 2^195806917 is an apocalyptic number.

It is an amenable number.

195806917 is a deficient number, since it is larger than the sum of its proper divisors (1).

195806917 is an equidigital number, since it uses as much as digits as its factorization.

195806917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 195806917 is about 13993.1024794361. The cubic root of 195806917 is about 580.6877661671.

The spelling of 195806917 in words is "one hundred ninety-five million, eight hundred six thousand, nine hundred seventeen".