8321591 has 2 divisors, whose sum is σ = 8321592. Its totient is φ = 8321590.

The previous prime is 8321557. The next prime is 8321603. The reversal of 8321591 is 1951238.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8321591 - 2⁶ = 8321527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8320591) 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, 4160795 + 4160796.

It is an arithmetic number, because the mean of its divisors is an integer number (4160796).

Almost surely, 2^8321591 is an apocalyptic number.

8321591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8321591 is an equidigital number, since it uses as much as digits as its factorization.

8321591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 8321591 is about 2884.7167971917. The cubic root of 8321591 is about 202.6447960996.

The spelling of 8321591 in words is "eight million, three hundred twenty-one thousand, five hundred ninety-one".