9964561 has 2 divisors, whose sum is σ = 9964562. Its totient is φ = 9964560.

The previous prime is 9964501. The next prime is 9964579. The reversal of 9964561 is 1654699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9960336 + 4225 = 3156^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 9964561 - 2⁹ = 9964049 is a prime.

It is not a weakly prime, because it can be changed into another prime (9964501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982280 + 4982281.

It is an arithmetic number, because the mean of its divisors is an integer number (4982281).

Almost surely, 2^9964561 is an apocalyptic number.

It is an amenable number.

9964561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9964561 is an equidigital number, since it uses as much as digits as its factorization.

9964561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 9964561 is about 3156.6692889817. The cubic root of 9964561 is about 215.1886643951.

The spelling of 9964561 in words is "nine million, nine hundred sixty-four thousand, five hundred sixty-one".