5631221 has 2 divisors, whose sum is σ = 5631222. Its totient is φ = 5631220.

The previous prime is 5631209. The next prime is 5631257. The reversal of 5631221 is 1221365.

5631221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4056196 + 1575025 = 2014^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631221 - 2²² = 1436917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5631193 and 5631202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5631271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815610 + 2815611.

It is an arithmetic number, because the mean of its divisors is an integer number (2815611).

Almost surely, 2^5631221 is an apocalyptic number.

It is an amenable number.

5631221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631221 is an equidigital number, since it uses as much as digits as its factorization.

5631221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 5631221 is about 2373.0193846659. The cubic root of 5631221 is about 177.9102038347.

Adding to 5631221 its reverse (1221365), we get a palindrome (6852586).

The spelling of 5631221 in words is "five million, six hundred thirty-one thousand, two hundred twenty-one".