191082368748209 has 2 divisors, whose sum is σ = 191082368748210. Its totient is φ = 191082368748208.

The previous prime is 191082368748149. The next prime is 191082368748247. The reversal of 191082368748209 is 902847863280191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100064510400625 + 91017858347584 = 10003225^2 + 9540328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191082368748209 is a prime.

It is not a weakly prime, because it can be changed into another prime (191082368748709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95541184374104 + 95541184374105.

It is an arithmetic number, because the mean of its divisors is an integer number (95541184374105).

Almost surely, 2^{191082368748209} is an apocalyptic number.

It is an amenable number.

191082368748209 is a deficient number, since it is larger than the sum of its proper divisors (1).

191082368748209 is an equidigital number, since it uses as much as digits as its factorization.

191082368748209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 191082368748209 in words is "one hundred ninety-one trillion, eighty-two billion, three hundred sixty-eight million, seven hundred forty-eight thousand, two hundred nine".