5531221 has 2 divisors, whose sum is σ = 5531222. Its totient is φ = 5531220.

The previous prime is 5531209. The next prime is 5531243. The reversal of 5531221 is 1221355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5267025 + 264196 = 2295^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 5531221 - 2¹³ = 5523029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5531291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765610 + 2765611.

It is an arithmetic number, because the mean of its divisors is an integer number (2765611).

Almost surely, 2^5531221 is an apocalyptic number.

It is an amenable number.

5531221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5531221 is an equidigital number, since it uses as much as digits as its factorization.

5531221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 19.

The square root of 5531221 is about 2351.8547999398. The cubic root of 5531221 is about 176.8507898040.

Adding to 5531221 its reverse (1221355), we get a palindrome (6752576).

The spelling of 5531221 in words is "five million, five hundred thirty-one thousand, two hundred twenty-one".