191173381163 has 2 divisors, whose sum is σ = 191173381164. Its totient is φ = 191173381162.

The previous prime is 191173381123. The next prime is 191173381177. The reversal of 191173381163 is 361183371191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191173381163 - 2⁶ = 191173381099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (191173381123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95586690581 + 95586690582.

It is an arithmetic number, because the mean of its divisors is an integer number (95586690582).

Almost surely, 2^191173381163 is an apocalyptic number.

191173381163 is a deficient number, since it is larger than the sum of its proper divisors (1).

191173381163 is an equidigital number, since it uses as much as digits as its factorization.

191173381163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The spelling of 191173381163 in words is "one hundred ninety-one billion, one hundred seventy-three million, three hundred eighty-one thousand, one hundred sixty-three".