53505209 has 2 divisors, whose sum is σ = 53505210. Its totient is φ = 53505208.

The previous prime is 53505191. The next prime is 53505211. The reversal of 53505209 is 90250535.

53505209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 7645225 = 6772^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 53505209 - 2⁸ = 53504953 is a prime.

Together with 53505211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53505259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26752604 + 26752605.

It is an arithmetic number, because the mean of its divisors is an integer number (26752605).

Almost surely, 2^53505209 is an apocalyptic number.

It is an amenable number.

53505209 is a deficient number, since it is larger than the sum of its proper divisors (1).

53505209 is an equidigital number, since it uses as much as digits as its factorization.

53505209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 53505209 is about 7314.7254904063. The cubic root of 53505209 is about 376.8183309502.

The spelling of 53505209 in words is "fifty-three million, five hundred five thousand, two hundred nine".