8105561 has 2 divisors, whose sum is σ = 8105562. Its totient is φ = 8105560.

The previous prime is 8105557. The next prime is 8105563. The reversal of 8105561 is 1655018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 1577536 = 2555^2 + 1256^2 .

It is a cyclic number.

It is not a de Polignac number, because 8105561 - 2² = 8105557 is a prime.

Together with 8105563, 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 8105561.

It is not a weakly prime, because it can be changed into another prime (8105563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4052780 + 4052781.

It is an arithmetic number, because the mean of its divisors is an integer number (4052781).

Almost surely, 2^8105561 is an apocalyptic number.

It is an amenable number.

8105561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8105561 is an equidigital number, since it uses as much as digits as its factorization.

8105561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 8105561 is about 2847.0266946413. The cubic root of 8105561 is about 200.8758339756.

The spelling of 8105561 in words is "eight million, one hundred five thousand, five hundred sixty-one".