8776561 has 2 divisors, whose sum is σ = 8776562. Its totient is φ = 8776560.

The previous prime is 8776553. The next prime is 8776567. The reversal of 8776561 is 1656778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4950625 + 3825936 = 2225^2 + 1956^2 .

It is a cyclic number.

It is not a de Polignac number, because 8776561 - 2³ = 8776553 is a prime.

It is a Chen prime.

8776561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8776567) 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, 4388280 + 4388281.

It is an arithmetic number, because the mean of its divisors is an integer number (4388281).

Almost surely, 2^8776561 is an apocalyptic number.

It is an amenable number.

8776561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8776561 is an equidigital number, since it uses as much as digits as its factorization.

8776561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The square root of 8776561 is about 2962.5261180283. The cubic root of 8776561 is about 206.2725600055.

The spelling of 8776561 in words is "eight million, seven hundred seventy-six thousand, five hundred sixty-one".