8521819 has 2 divisors, whose sum is σ = 8521820. Its totient is φ = 8521818.

The previous prime is 8521813. The next prime is 8521829. The reversal of 8521819 is 9181258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8521819 - 2⁵ = 8521787 is a prime.

It is a super-2 number, since 2×8521819² = 145242798137522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8521813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260909 + 4260910.

It is an arithmetic number, because the mean of its divisors is an integer number (4260910).

Almost surely, 2^8521819 is an apocalyptic number.

8521819 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521819 is an equidigital number, since it uses as much as digits as its factorization.

8521819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 34.

The square root of 8521819 is about 2919.2154768019. The cubic root of 8521819 is about 204.2572287022.

It can be divided in two parts, 85 and 21819, that added together give a square (21904 = 148²).

The spelling of 8521819 in words is "eight million, five hundred twenty-one thousand, eight hundred nineteen".