9191109197 has 2 divisors, whose sum is σ = 9191109198. Its totient is φ = 9191109196.

The previous prime is 9191109167. The next prime is 9191109259. The reversal of 9191109197 is 7919011919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9190865161 + 244036 = 95869^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 9191109197 - 2¹⁶ = 9191043661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9191109167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595554598 + 4595554599.

It is an arithmetic number, because the mean of its divisors is an integer number (4595554599).

Almost surely, 2^9191109197 is an apocalyptic number.

It is an amenable number.

9191109197 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191109197 is an equidigital number, since it uses as much as digits as its factorization.

9191109197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 47.

The square root of 9191109197 is about 95870.2727491687. The cubic root of 9191109197 is about 2094.7039031827.

The spelling of 9191109197 in words is "nine billion, one hundred ninety-one million, one hundred nine thousand, one hundred ninety-seven".