8650561 has 2 divisors, whose sum is σ = 8650562. Its totient is φ = 8650560.

The previous prime is 8650559. The next prime is 8650583. The reversal of 8650561 is 1650568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7398400 + 1252161 = 2720^2 + 1119^2 .

It is a cyclic number.

It is not a de Polignac number, because 8650561 - 2¹ = 8650559 is a prime.

It is a super-2 number, since 2×8650561² = 149664411229442, which contains 22 as substring.

Together with 8650559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8650511) 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, 4325280 + 4325281.

It is an arithmetic number, because the mean of its divisors is an integer number (4325281).

Almost surely, 2^8650561 is an apocalyptic number.

It is an amenable number.

8650561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8650561 is an equidigital number, since it uses as much as digits as its factorization.

8650561 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 8650561 is about 2941.1836052855. The cubic root of 8650561 is about 205.2806862997.

The spelling of 8650561 in words is "eight million, six hundred fifty thousand, five hundred sixty-one".