8117561 has 2 divisors, whose sum is σ = 8117562. Its totient is φ = 8117560.

The previous prime is 8117537. The next prime is 8117569. The reversal of 8117561 is 1657118.

8117561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 609961 = 2740^2 + 781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8117561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8117569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4058780 + 4058781.

It is an arithmetic number, because the mean of its divisors is an integer number (4058781).

Almost surely, 2^8117561 is an apocalyptic number.

It is an amenable number.

8117561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8117561 is an equidigital number, since it uses as much as digits as its factorization.

8117561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 29.

The square root of 8117561 is about 2849.1333770113. The cubic root of 8117561 is about 200.9749149821.

The spelling of 8117561 in words is "eight million, one hundred seventeen thousand, five hundred sixty-one".