191117393197 has 2 divisors, whose sum is σ = 191117393198. Its totient is φ = 191117393196.

The previous prime is 191117393123. The next prime is 191117393219. The reversal of 191117393197 is 791393711191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144587020516 + 46530372681 = 380246^2 + 215709^2 .

It is a cyclic number.

It is not a de Polignac number, because 191117393197 - 2³⁵ = 156757654829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191117493197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95558696598 + 95558696599.

It is an arithmetic number, because the mean of its divisors is an integer number (95558696599).

Almost surely, 2^191117393197 is an apocalyptic number.

It is an amenable number.

191117393197 is a deficient number, since it is larger than the sum of its proper divisors (1).

191117393197 is an equidigital number, since it uses as much as digits as its factorization.

191117393197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 321489, while the sum is 52.

The spelling of 191117393197 in words is "one hundred ninety-one billion, one hundred seventeen million, three hundred ninety-three thousand, one hundred ninety-seven".