8999609 has 2 divisors, whose sum is σ = 8999610. Its totient is φ = 8999608.

The previous prime is 8999581. The next prime is 8999651. The reversal of 8999609 is 9069998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8970025 + 29584 = 2995^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 8999609 - 2¹² = 8995513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8999699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499804 + 4499805.

It is an arithmetic number, because the mean of its divisors is an integer number (4499805).

Almost surely, 2^8999609 is an apocalyptic number.

It is an amenable number.

8999609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999609 is an equidigital number, since it uses as much as digits as its factorization.

8999609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 8999609 is about 2999.9348326255. The cubic root of 8999609 is about 208.0053699920.

The spelling of 8999609 in words is "eight million, nine hundred ninety-nine thousand, six hundred nine".