8191279 has 2 divisors, whose sum is σ = 8191280. Its totient is φ = 8191278.

The previous prime is 8191277. The next prime is 8191283. The reversal of 8191279 is 9721918.

8191279 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8191279 - 2¹ = 8191277 is a prime.

Together with 8191277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8191277) 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, 4095639 + 4095640.

It is an arithmetic number, because the mean of its divisors is an integer number (4095640).

Almost surely, 2^8191279 is an apocalyptic number.

8191279 is a deficient number, since it is larger than the sum of its proper divisors (1).

8191279 is an equidigital number, since it uses as much as digits as its factorization.

8191279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 8191279 is about 2862.0410549117. The cubic root of 8191279 is about 201.5814537271.

The spelling of 8191279 in words is "eight million, one hundred ninety-one thousand, two hundred seventy-nine".