252440809 has 2 divisors, whose sum is σ = 252440810. Its totient is φ = 252440808.

The previous prime is 252440779. The next prime is 252440857. The reversal of 252440809 is 908044252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252333225 + 107584 = 15885^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 252440809 - 2⁵ = 252440777 is a prime.

It is not a weakly prime, because it can be changed into another prime (252440869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126220404 + 126220405.

It is an arithmetic number, because the mean of its divisors is an integer number (126220405).

Almost surely, 2^252440809 is an apocalyptic number.

It is an amenable number.

252440809 is a deficient number, since it is larger than the sum of its proper divisors (1).

252440809 is an equidigital number, since it uses as much as digits as its factorization.

252440809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 252440809 is about 15888.3859784435. The cubic root of 252440809 is about 632.0040399584.

The spelling of 252440809 in words is "two hundred fifty-two million, four hundred forty thousand, eight hundred nine".