4905209 has 2 divisors, whose sum is σ = 4905210. Its totient is φ = 4905208.

The previous prime is 4905181. The next prime is 4905221. The reversal of 4905209 is 9025094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4826809 + 78400 = 2197^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 4905209 - 2¹⁶ = 4839673 is a prime.

It is a super-2 number, since 2×4905209² = 48122150667362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4905259) 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, 2452604 + 2452605.

It is an arithmetic number, because the mean of its divisors is an integer number (2452605).

Almost surely, 2^4905209 is an apocalyptic number.

It is an amenable number.

4905209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4905209 is an equidigital number, since it uses as much as digits as its factorization.

4905209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 4905209 is about 2214.7706427529. The cubic root of 4905209 is about 169.9100908658.

Subtracting 4905209 from its reverse (9025094), we obtain a triangular number (4119885 = T₂₈₇₀).

The spelling of 4905209 in words is "four million, nine hundred five thousand, two hundred nine".