252647809 has 2 divisors, whose sum is σ = 252647810. Its totient is φ = 252647808.

The previous prime is 252647783. The next prime is 252647839. The reversal of 252647809 is 908746252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129504400 + 123143409 = 11380^2 + 11097^2 .

It is a cyclic number.

It is not a de Polignac number, because 252647809 - 2²³ = 244259201 is a prime.

It is not a weakly prime, because it can be changed into another prime (252647839) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126323904 + 126323905.

It is an arithmetic number, because the mean of its divisors is an integer number (126323905).

Almost surely, 2^252647809 is an apocalyptic number.

It is an amenable number.

252647809 is a deficient number, since it is larger than the sum of its proper divisors (1).

252647809 is an equidigital number, since it uses as much as digits as its factorization.

252647809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 252647809 is about 15894.8988357901. The cubic root of 252647809 is about 632.1767393126.

The spelling of 252647809 in words is "two hundred fifty-two million, six hundred forty-seven thousand, eight hundred nine".