53543209 has 2 divisors, whose sum is σ = 53543210. Its totient is φ = 53543208.

The previous prime is 53543179. The next prime is 53543219. The reversal of 53543209 is 90234535.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47997184 + 5546025 = 6928^2 + 2355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53543209 is a prime.

It is not a weakly prime, because it can be changed into another prime (53543219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26771604 + 26771605.

It is an arithmetic number, because the mean of its divisors is an integer number (26771605).

Almost surely, 2^53543209 is an apocalyptic number.

It is an amenable number.

53543209 is a deficient number, since it is larger than the sum of its proper divisors (1).

53543209 is an equidigital number, since it uses as much as digits as its factorization.

53543209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 53543209 is about 7317.3225294502. The cubic root of 53543209 is about 376.9075167094.

The spelling of 53543209 in words is "fifty-three million, five hundred forty-three thousand, two hundred nine".