53439209 has 2 divisors, whose sum is σ = 53439210. Its totient is φ = 53439208.

The previous prime is 53439203. The next prime is 53439227. The reversal of 53439209 is 90293435.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 19333609 = 5840^2 + 4397^2 .

It is a cyclic number.

It is not a de Polignac number, because 53439209 - 2⁴ = 53439193 is a prime.

It is not a weakly prime, because it can be changed into another prime (53439203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26719604 + 26719605.

It is an arithmetic number, because the mean of its divisors is an integer number (26719605).

Almost surely, 2^53439209 is an apocalyptic number.

It is an amenable number.

53439209 is a deficient number, since it is larger than the sum of its proper divisors (1).

53439209 is an equidigital number, since it uses as much as digits as its factorization.

53439209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 53439209 is about 7310.2126508057. The cubic root of 53439209 is about 376.6633289529.

The spelling of 53439209 in words is "fifty-three million, four hundred thirty-nine thousand, two hundred nine".