5172221 has 2 divisors, whose sum is σ = 5172222. Its totient is φ = 5172220.

The previous prime is 5172197. The next prime is 5172227. The reversal of 5172221 is 1222715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5152900 + 19321 = 2270^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 5172221 - 2¹⁰ = 5171197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 5172193 and 5172202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5172227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2586110 + 2586111.

It is an arithmetic number, because the mean of its divisors is an integer number (2586111).

Almost surely, 2^5172221 is an apocalyptic number.

It is an amenable number.

5172221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5172221 is an equidigital number, since it uses as much as digits as its factorization.

5172221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 20.

The square root of 5172221 is about 2274.2517450801. The cubic root of 5172221 is about 172.9387667952.

Adding to 5172221 its reverse (1222715), we get a palindrome (6394936).

The spelling of 5172221 in words is "five million, one hundred seventy-two thousand, two hundred twenty-one".