52638221 has 2 divisors, whose sum is σ = 52638222. Its totient is φ = 52638220.

The previous prime is 52638211. The next prime is 52638251. The reversal of 52638221 is 12283625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47416996 + 5221225 = 6886^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 52638221 - 2¹⁰ = 52637197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52638211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26319110 + 26319111.

It is an arithmetic number, because the mean of its divisors is an integer number (26319111).

Almost surely, 2^52638221 is an apocalyptic number.

It is an amenable number.

52638221 is a deficient number, since it is larger than the sum of its proper divisors (1).

52638221 is an equidigital number, since it uses as much as digits as its factorization.

52638221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 52638221 is about 7255.2202585449. The cubic root of 52638221 is about 374.7719407395.

The spelling of 52638221 in words is "fifty-two million, six hundred thirty-eight thousand, two hundred twenty-one".