9868561 has 2 divisors, whose sum is σ = 9868562. Its totient is φ = 9868560.

The previous prime is 9868559. The next prime is 9868597. The reversal of 9868561 is 1658689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5202961 + 4665600 = 2281^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 9868561 - 2¹ = 9868559 is a prime.

Together with 9868559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9868501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4934280 + 4934281.

It is an arithmetic number, because the mean of its divisors is an integer number (4934281).

Almost surely, 2^9868561 is an apocalyptic number.

It is an amenable number.

9868561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9868561 is an equidigital number, since it uses as much as digits as its factorization.

9868561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 9868561 is about 3141.4265867596. The cubic root of 9868561 is about 214.4953804588.

The spelling of 9868561 in words is "nine million, eight hundred sixty-eight thousand, five hundred sixty-one".