53705209 has 2 divisors, whose sum is σ = 53705210. Its totient is φ = 53705208.

The previous prime is 53705173. The next prime is 53705213. The reversal of 53705209 is 90250735.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53699584 + 5625 = 7328^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 53705209 - 2¹¹ = 53703161 is a prime.

It is not a weakly prime, because it can be changed into another prime (53705279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26852604 + 26852605.

It is an arithmetic number, because the mean of its divisors is an integer number (26852605).

Almost surely, 2^53705209 is an apocalyptic number.

It is an amenable number.

53705209 is a deficient number, since it is larger than the sum of its proper divisors (1).

53705209 is an equidigital number, since it uses as much as digits as its factorization.

53705209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 53705209 is about 7328.3837918057. The cubic root of 53705209 is about 377.2872569990.

The spelling of 53705209 in words is "fifty-three million, seven hundred five thousand, two hundred nine".