4821209 has 2 divisors, whose sum is σ = 4821210. Its totient is φ = 4821208.

The previous prime is 4821199. The next prime is 4821239. The reversal of 4821209 is 9021284.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4609609 + 211600 = 2147^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 4821209 - 2²⁰ = 3772633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4821239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2410604 + 2410605.

It is an arithmetic number, because the mean of its divisors is an integer number (2410605).

Almost surely, 2^4821209 is an apocalyptic number.

It is an amenable number.

4821209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4821209 is an equidigital number, since it uses as much as digits as its factorization.

4821209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 4821209 is about 2195.7251649512. The cubic root of 4821209 is about 168.9346175195.

The spelling of 4821209 in words is "four million, eight hundred twenty-one thousand, two hundred nine".