195520709 has 2 divisors, whose sum is σ = 195520710. Its totient is φ = 195520708.

The previous prime is 195520679. The next prime is 195520711. The reversal of 195520709 is 907025591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178890625 + 16630084 = 13375^2 + 4078^2 .

It is a cyclic number.

It is not a de Polignac number, because 195520709 - 2⁸ = 195520453 is a prime.

Together with 195520711, 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 (195520739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97760354 + 97760355.

It is an arithmetic number, because the mean of its divisors is an integer number (97760355).

Almost surely, 2^195520709 is an apocalyptic number.

It is an amenable number.

195520709 is a deficient number, since it is larger than the sum of its proper divisors (1).

195520709 is an equidigital number, since it uses as much as digits as its factorization.

195520709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 195520709 is about 13982.8719868273. The cubic root of 195520709 is about 580.4047007054.

The spelling of 195520709 in words is "one hundred ninety-five million, five hundred twenty thousand, seven hundred nine".