8278561 has 2 divisors, whose sum is σ = 8278562. Its totient is φ = 8278560.

The previous prime is 8278559. The next prime is 8278577. The reversal of 8278561 is 1658728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4177936 + 4100625 = 2044^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 8278561 - 2¹ = 8278559 is a prime.

Together with 8278559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8278561.

It is not a weakly prime, because it can be changed into another prime (8278511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4139280 + 4139281.

It is an arithmetic number, because the mean of its divisors is an integer number (4139281).

Almost surely, 2^8278561 is an apocalyptic number.

It is an amenable number.

8278561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8278561 is an equidigital number, since it uses as much as digits as its factorization.

8278561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 8278561 is about 2877.2488595879. The cubic root of 8278561 is about 202.2949079348.

The spelling of 8278561 in words is "eight million, two hundred seventy-eight thousand, five hundred sixty-one".