9491609 has 2 divisors, whose sum is σ = 9491610. Its totient is φ = 9491608.

The previous prime is 9491597. The next prime is 9491633. The reversal of 9491609 is 9061949.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8248384 + 1243225 = 2872^2 + 1115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9491609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9491309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745804 + 4745805.

It is an arithmetic number, because the mean of its divisors is an integer number (4745805).

Almost surely, 2^9491609 is an apocalyptic number.

It is an amenable number.

9491609 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491609 is an equidigital number, since it uses as much as digits as its factorization.

9491609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 9491609 is about 3080.8455008325. The cubic root of 9491609 is about 211.7288050630.

The spelling of 9491609 in words is "nine million, four hundred ninety-one thousand, six hundred nine".