5178221 has 4 divisors (see below), whose sum is σ = 5182812. Its totient is φ = 5173632.

The previous prime is 5178193. The next prime is 5178301. The reversal of 5178221 is 1228715.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1297321 + 3880900 = 1139^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 5178221 - 2¹⁴ = 5161837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5178521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701 + ... + 3293.

It is an arithmetic number, because the mean of its divisors is an integer number (1295703).

Almost surely, 2^5178221 is an apocalyptic number.

It is an amenable number.

5178221 is a deficient number, since it is larger than the sum of its proper divisors (4591).

5178221 is a wasteful number, since it uses less digits than its factorization.

5178221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590.

The product of its digits is 1120, while the sum is 26.

The square root of 5178221 is about 2275.5704779242. The cubic root of 5178221 is about 173.0056131027.

The spelling of 5178221 in words is "five million, one hundred seventy-eight thousand, two hundred twenty-one".