4909 has 2 divisors, whose sum is σ = 4910. Its totient is φ = 4908.

The previous prime is 4903. The next prime is 4919. The reversal of 4909 is 9094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4900 + 9 = 70^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 4909 - 2⁵ = 4877 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 8.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 4909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4903) 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, 2454 + 2455.

It is an arithmetic number, because the mean of its divisors is an integer number (2455).

2⁴⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

4909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4909 is an equidigital number, since it uses as much as digits as its factorization.

4909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 4909 is about 70.0642562224. The cubic root of 4909 is about 16.9953851372.

The spelling of 4909 in words is "four thousand, nine hundred nine".