53820209 has 2 divisors, whose sum is σ = 53820210. Its totient is φ = 53820208.

The previous prime is 53820191. The next prime is 53820257. The reversal of 53820209 is 90202835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45427600 + 8392609 = 6740^2 + 2897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53820209 is a prime.

It is a super-2 number, since 2×53820209² = 5793229793607362, which contains 22 as substring.

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 (53826209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26910104 + 26910105.

It is an arithmetic number, because the mean of its divisors is an integer number (26910105).

Almost surely, 2^53820209 is an apocalyptic number.

It is an amenable number.

53820209 is a deficient number, since it is larger than the sum of its proper divisors (1).

53820209 is an equidigital number, since it uses as much as digits as its factorization.

53820209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 53820209 is about 7336.2258007779. The cubic root of 53820209 is about 377.5563625038.

The spelling of 53820209 in words is "fifty-three million, eight hundred twenty thousand, two hundred nine".