9191993 has 2 divisors, whose sum is σ = 9191994. Its totient is φ = 9191992.

The previous prime is 9191989. The next prime is 9192013. The reversal of 9191993 is 3991919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7661824 + 1530169 = 2768^2 + 1237^2 .

It is a cyclic number.

It is not a de Polignac number, because 9191993 - 2² = 9191989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9191993.

It is not a weakly prime, because it can be changed into another prime (9191933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595996 + 4595997.

It is an arithmetic number, because the mean of its divisors is an integer number (4595997).

Almost surely, 2^9191993 is an apocalyptic number.

It is an amenable number.

9191993 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191993 is an equidigital number, since it uses as much as digits as its factorization.

9191993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19683, while the sum is 41.

The square root of 9191993 is about 3031.8299754439. The cubic root of 9191993 is about 209.4771042205.

The spelling of 9191993 in words is "nine million, one hundred ninety-one thousand, nine hundred ninety-three".