8605561 has 2 divisors, whose sum is σ = 8605562. Its totient is φ = 8605560.

The previous prime is 8605543. The next prime is 8605567. The reversal of 8605561 is 1655068.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7595536 + 1010025 = 2756^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 8605561 - 2⁵ = 8605529 is a prime.

8605561 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8605567) 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, 4302780 + 4302781.

It is an arithmetic number, because the mean of its divisors is an integer number (4302781).

Almost surely, 2^8605561 is an apocalyptic number.

It is an amenable number.

8605561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8605561 is an equidigital number, since it uses as much as digits as its factorization.

8605561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 8605561 is about 2933.5236491291. The cubic root of 8605561 is about 204.9241123037.

The spelling of 8605561 in words is "eight million, six hundred five thousand, five hundred sixty-one".