252321809 has 2 divisors, whose sum is σ = 252321810. Its totient is φ = 252321808.

The previous prime is 252321791. The next prime is 252321857. The reversal of 252321809 is 908123252.

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., 223592209 + 28729600 = 14953^2 + 5360^2 .

It is a cyclic number.

It is not a de Polignac number, because 252321809 - 2¹² = 252317713 is a prime.

It is not a weakly prime, because it can be changed into another prime (252321869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126160904 + 126160905.

It is an arithmetic number, because the mean of its divisors is an integer number (126160905).

Almost surely, 2^252321809 is an apocalyptic number.

It is an amenable number.

252321809 is a deficient number, since it is larger than the sum of its proper divisors (1).

252321809 is an equidigital number, since it uses as much as digits as its factorization.

252321809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 252321809 is about 15884.6406632319. The cubic root of 252321809 is about 631.9047159468.

The spelling of 252321809 in words is "two hundred fifty-two million, three hundred twenty-one thousand, eight hundred nine".