53249809 has 2 divisors, whose sum is σ = 53249810. Its totient is φ = 53249808.

The previous prime is 53249803. The next prime is 53249827. The reversal of 53249809 is 90894235.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53246209 + 3600 = 7297^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 53249809 - 2⁷ = 53249681 is a prime.

It is not a weakly prime, because it can be changed into another prime (53249803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26624904 + 26624905.

It is an arithmetic number, because the mean of its divisors is an integer number (26624905).

Almost surely, 2^53249809 is an apocalyptic number.

It is an amenable number.

53249809 is a deficient number, since it is larger than the sum of its proper divisors (1).

53249809 is an equidigital number, since it uses as much as digits as its factorization.

53249809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 53249809 is about 7297.2466725471. The cubic root of 53249809 is about 376.2178103681.

The spelling of 53249809 in words is "fifty-three million, two hundred forty-nine thousand, eight hundred nine".