5166221 has 2 divisors, whose sum is σ = 5166222. Its totient is φ = 5166220.

The previous prime is 5166211. The next prime is 5166223. The reversal of 5166221 is 1226615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4468996 + 697225 = 2114^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 5166221 - 2¹⁸ = 4904077 is a prime.

Together with 5166223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5166223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583110 + 2583111.

It is an arithmetic number, because the mean of its divisors is an integer number (2583111).

Almost surely, 2^5166221 is an apocalyptic number.

It is an amenable number.

5166221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5166221 is an equidigital number, since it uses as much as digits as its factorization.

5166221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 5166221 is about 2272.9322471204. The cubic root of 5166221 is about 172.8718687712.

The spelling of 5166221 in words is "five million, one hundred sixty-six thousand, two hundred twenty-one".