8255561 has 2 divisors, whose sum is σ = 8255562. Its totient is φ = 8255560.

The previous prime is 8255549. The next prime is 8255563. The reversal of 8255561 is 1655528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 1849600 = 2531^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 8255561 - 2¹⁴ = 8239177 is a prime.

Together with 8255563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8255563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4127780 + 4127781.

It is an arithmetic number, because the mean of its divisors is an integer number (4127781).

Almost surely, 2^8255561 is an apocalyptic number.

It is an amenable number.

8255561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8255561 is an equidigital number, since it uses as much as digits as its factorization.

8255561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 32.

The square root of 8255561 is about 2873.2492060383. The cubic root of 8255561 is about 202.1073915123.

The spelling of 8255561 in words is "eight million, two hundred fifty-five thousand, five hundred sixty-one".