8255521 has 2 divisors, whose sum is σ = 8255522. Its totient is φ = 8255520.

The previous prime is 8255509. The next prime is 8255549. The reversal of 8255521 is 1255528.

It is an a-pointer prime, because the next prime (8255549) can be obtained adding 8255521 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4410000 + 3845521 = 2100^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 8255521 - 2¹¹ = 8253473 is a prime.

8255521 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8255521.

It is not a weakly prime, because it can be changed into another prime (8255501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4127760 + 4127761.

It is an arithmetic number, because the mean of its divisors is an integer number (4127761).

Almost surely, 2^8255521 is an apocalyptic number.

It is an amenable number.

8255521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8255521 is an equidigital number, since it uses as much as digits as its factorization.

8255521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000, while the sum is 28.

The square root of 8255521 is about 2873.2422452693. The cubic root of 8255521 is about 202.1070650936.

The spelling of 8255521 in words is "eight million, two hundred fifty-five thousand, five hundred twenty-one".