195299051309 has 2 divisors, whose sum is σ = 195299051310. Its totient is φ = 195299051308.

The previous prime is 195299051287. The next prime is 195299051317. The reversal of 195299051309 is 903150992591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134485025284 + 60814026025 = 366722^2 + 246605^2 .

It is a cyclic number.

It is not a de Polignac number, because 195299051309 - 2⁸ = 195299051053 is a prime.

It is a super-2 number, since 2×195299051309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195299051209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97649525654 + 97649525655.

It is an arithmetic number, because the mean of its divisors is an integer number (97649525655).

Almost surely, 2^195299051309 is an apocalyptic number.

It is an amenable number.

195299051309 is a deficient number, since it is larger than the sum of its proper divisors (1).

195299051309 is an equidigital number, since it uses as much as digits as its factorization.

195299051309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 984150, while the sum is 53.

The spelling of 195299051309 in words is "one hundred ninety-five billion, two hundred ninety-nine million, fifty-one thousand, three hundred nine".