252581221 has 2 divisors, whose sum is σ = 252581222. Its totient is φ = 252581220.

The previous prime is 252581207. The next prime is 252581299. The reversal of 252581221 is 122185252.

252581221 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., 252364996 + 216225 = 15886^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 252581221 - 2⁹ = 252580709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252581221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252581621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126290610 + 126290611.

It is an arithmetic number, because the mean of its divisors is an integer number (126290611).

Almost surely, 2^252581221 is an apocalyptic number.

It is an amenable number.

252581221 is a deficient number, since it is larger than the sum of its proper divisors (1).

252581221 is an equidigital number, since it uses as much as digits as its factorization.

252581221 is an evil number, because the sum of its binary digits is even.

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

The square root of 252581221 is about 15892.8040634748. The cubic root of 252581221 is about 632.1211954791.

The spelling of 252581221 in words is "two hundred fifty-two million, five hundred eighty-one thousand, two hundred twenty-one".