8191291 has 2 divisors, whose sum is σ = 8191292. Its totient is φ = 8191290.

The previous prime is 8191283. The next prime is 8191307. The reversal of 8191291 is 1921918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8191291 - 2³ = 8191283 is a prime.

8191291 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8191091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4095645 + 4095646.

It is an arithmetic number, because the mean of its divisors is an integer number (4095646).

Almost surely, 2^8191291 is an apocalyptic number.

8191291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8191291 is an equidigital number, since it uses as much as digits as its factorization.

8191291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 31.

The square root of 8191291 is about 2862.0431513169. The cubic root of 8191291 is about 201.5815521642.

The spelling of 8191291 in words is "eight million, one hundred ninety-one thousand, two hundred ninety-one".