8226991 has 2 divisors, whose sum is σ = 8226992. Its totient is φ = 8226990.

The previous prime is 8226989. The next prime is 8227003. The reversal of 8226991 is 1996228.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8226991 - 2¹ = 8226989 is a prime.

Together with 8226989, it forms a pair of twin primes.

8226991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8226991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8226941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4113495 + 4113496.

It is an arithmetic number, because the mean of its divisors is an integer number (4113496).

Almost surely, 2^8226991 is an apocalyptic number.

8226991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8226991 is an equidigital number, since it uses as much as digits as its factorization.

8226991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 8226991 is about 2868.2731738801. The cubic root of 8226991 is about 201.8739778597.

The spelling of 8226991 in words is "eight million, two hundred twenty-six thousand, nine hundred ninety-one".