9149809 has 2 divisors, whose sum is σ = 9149810. Its totient is φ = 9149808.

The previous prime is 9149807. The next prime is 9149813. The reversal of 9149809 is 9089419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4752400 + 4397409 = 2180^2 + 2097^2 .

It is an emirp because it is prime and its reverse (9089419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9149809 - 2¹ = 9149807 is a prime.

Together with 9149807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9149801) 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, 4574904 + 4574905.

It is an arithmetic number, because the mean of its divisors is an integer number (4574905).

Almost surely, 2^9149809 is an apocalyptic number.

It is an amenable number.

9149809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9149809 is an equidigital number, since it uses as much as digits as its factorization.

9149809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 9149809 is about 3024.8651209599. The cubic root of 9149809 is about 209.1561678584.

The spelling of 9149809 in words is "nine million, one hundred forty-nine thousand, eight hundred nine".