5418221 has 2 divisors, whose sum is σ = 5418222. Its totient is φ = 5418220.

The previous prime is 5418181. The next prime is 5418229. The reversal of 5418221 is 1228145.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4120900 + 1297321 = 2030^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5418221 is a prime.

It is a Sophie Germain 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 (5418229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2709110 + 2709111.

It is an arithmetic number, because the mean of its divisors is an integer number (2709111).

Almost surely, 2^5418221 is an apocalyptic number.

It is an amenable number.

5418221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5418221 is an equidigital number, since it uses as much as digits as its factorization.

5418221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 23.

The square root of 5418221 is about 2327.7072410421. The cubic root of 5418221 is about 175.6381706413.

It can be divided in two parts, 5418 and 221, that multiplied together give a triangular number (1197378 = T₁₅₄₇).

The spelling of 5418221 in words is "five million, four hundred eighteen thousand, two hundred twenty-one".