252218809 has 2 divisors, whose sum is σ = 252218810. Its totient is φ = 252218808.

The previous prime is 252218807. The next prime is 252218833. The reversal of 252218809 is 908812252.

252218809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222755625 + 29463184 = 14925^2 + 5428^2 .

It is a cyclic number.

It is not a de Polignac number, because 252218809 - 2¹ = 252218807 is a prime.

It is a super-2 number, since 2×252218809² = 127228655226756962, which contains 22 as substring.

Together with 252218807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (252218803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126109404 + 126109405.

It is an arithmetic number, because the mean of its divisors is an integer number (126109405).

Almost surely, 2^252218809 is an apocalyptic number.

It is an amenable number.

252218809 is a deficient number, since it is larger than the sum of its proper divisors (1).

252218809 is an equidigital number, since it uses as much as digits as its factorization.

252218809 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 37.

The square root of 252218809 is about 15881.3982067071. The cubic root of 252218809 is about 631.8187212082.

The spelling of 252218809 in words is "two hundred fifty-two million, two hundred eighteen thousand, eight hundred nine".