252678221 has 2 divisors, whose sum is σ = 252678222. Its totient is φ = 252678220.

The previous prime is 252678149. The next prime is 252678263. The reversal of 252678221 is 122876252.

252678221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252015625 + 662596 = 15875^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 252678221 - 2¹⁰ = 252677197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252678821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126339110 + 126339111.

It is an arithmetic number, because the mean of its divisors is an integer number (126339111).

Almost surely, 2^252678221 is an apocalyptic number.

It is an amenable number.

252678221 is a deficient number, since it is larger than the sum of its proper divisors (1).

252678221 is an equidigital number, since it uses as much as digits as its factorization.

252678221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 252678221 is about 15895.8554661270. The cubic root of 252678221 is about 632.2021039861.

The spelling of 252678221 in words is "two hundred fifty-two million, six hundred seventy-eight thousand, two hundred twenty-one".