252518221 has 8 divisors (see below), whose sum is σ = 273894264. Its totient is φ = 231866880.

The previous prime is 252518213. The next prime is 252518237. The reversal of 252518221 is 122815252.

It can be written as a sum of positive squares in 4 ways, for example, as 23328900 + 229189321 = 4830^2 + 15139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252518221 - 2³ = 252518213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252518221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252518251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180450 + ... + 181843.

It is an arithmetic number, because the mean of its divisors is an integer number (34236783).

Almost surely, 2^252518221 is an apocalyptic number.

It is an amenable number.

252518221 is a deficient number, since it is larger than the sum of its proper divisors (21376043).

252518221 is a wasteful number, since it uses less digits than its factorization.

252518221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362351.

The product of its digits is 3200, while the sum is 28.

The square root of 252518221 is about 15890.8219107760. The cubic root of 252518221 is about 632.0686355585.

The spelling of 252518221 in words is "two hundred fifty-two million, five hundred eighteen thousand, two hundred twenty-one".