195639317 has 2 divisors, whose sum is σ = 195639318. Its totient is φ = 195639316.

The previous prime is 195639253. The next prime is 195639319. The reversal of 195639317 is 713936591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153115876 + 42523441 = 12374^2 + 6521^2 .

It is an emirp because it is prime and its reverse (713936591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195639317 - 2⁶ = 195639253 is a prime.

It is a super-3 number, since 3×195639317³ (a number of 26 digits) contains 333 as substring.

Together with 195639319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195639319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97819658 + 97819659.

It is an arithmetic number, because the mean of its divisors is an integer number (97819659).

Almost surely, 2^195639317 is an apocalyptic number.

It is an amenable number.

195639317 is a deficient number, since it is larger than the sum of its proper divisors (1).

195639317 is an equidigital number, since it uses as much as digits as its factorization.

195639317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 44.

The square root of 195639317 is about 13987.1125326137. The cubic root of 195639317 is about 580.5220398961.

The spelling of 195639317 in words is "one hundred ninety-five million, six hundred thirty-nine thousand, three hundred seventeen".