5278221 has 24 divisors (see below), whose sum is σ = 8288280. Its totient is φ = 3217536.

The previous prime is 5278171. The next prime is 5278223. The reversal of 5278221 is 1228725.

It can be written as a sum of positive squares in 4 ways, for example, as 2604996 + 2673225 = 1614^2 + 1635^2 .

It is not a de Polignac number, because 5278221 - 2⁷ = 5278093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5278223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22935 + ... + 23163.

It is an arithmetic number, because the mean of its divisors is an integer number (345345).

Almost surely, 2^5278221 is an apocalyptic number.

It is an amenable number.

5278221 is a deficient number, since it is larger than the sum of its proper divisors (3010059).

5278221 is a wasteful number, since it uses less digits than its factorization.

5278221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 442 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 5278221 is about 2297.4379208153. The cubic root of 5278221 is about 174.1121947838.

The spelling of 5278221 in words is "five million, two hundred seventy-eight thousand, two hundred twenty-one".