8185819 has 2 divisors, whose sum is σ = 8185820. Its totient is φ = 8185818.

The previous prime is 8185817. The next prime is 8185873. The reversal of 8185819 is 9185818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8185819 - 2¹ = 8185817 is a prime.

It is a super-2 number, since 2×8185819² = 134015265401522, which contains 22 as substring.

Together with 8185817, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8185813) 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, 4092909 + 4092910.

It is an arithmetic number, because the mean of its divisors is an integer number (4092910).

Almost surely, 2^8185819 is an apocalyptic number.

8185819 is a deficient number, since it is larger than the sum of its proper divisors (1).

8185819 is an equidigital number, since it uses as much as digits as its factorization.

8185819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 40.

The square root of 8185819 is about 2861.0870311824. The cubic root of 8185819 is about 201.5366548878.

Subtracting 8185819 from its reverse (9185818), we obtain a palindrome (999999).

The spelling of 8185819 in words is "eight million, one hundred eighty-five thousand, eight hundred nineteen".