8416561 has 2 divisors, whose sum is σ = 8416562. Its totient is φ = 8416560.

The previous prime is 8416511. The next prime is 8416567. The reversal of 8416561 is 1656148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8410000 + 6561 = 2900^2 + 81^2 .

It is a cyclic number.

It is not a de Polignac number, because 8416561 - 2⁹ = 8416049 is a prime.

It is not a weakly prime, because it can be changed into another prime (8416567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4208280 + 4208281.

It is an arithmetic number, because the mean of its divisors is an integer number (4208281).

Almost surely, 2^8416561 is an apocalyptic number.

It is an amenable number.

8416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8416561 is an equidigital number, since it uses as much as digits as its factorization.

8416561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 8416561 is about 2901.1309863569. The cubic root of 8416561 is about 203.4127752528.

It can be divided in two parts, 841 and 6561, that multiplied together give a square (5517801 = 2349²).

The spelling of 8416561 in words is "eight million, four hundred sixteen thousand, five hundred sixty-one".