1358221 has 2 divisors, whose sum is σ = 1358222. Its totient is φ = 1358220.

The previous prime is 1358213. The next prime is 1358251. The reversal of 1358221 is 1228531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1322500 + 35721 = 1150^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1358221 - 2³ = 1358213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1358192 and 1358201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1358251) 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, 679110 + 679111.

It is an arithmetic number, because the mean of its divisors is an integer number (679111).

2^1358221 is an apocalyptic number.

It is an amenable number.

1358221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1358221 is an equidigital number, since it uses as much as digits as its factorization.

1358221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 1358221 is about 1165.4273894156. The cubic root of 1358221 is about 110.7448349770.

The spelling of 1358221 in words is "one million, three hundred fifty-eight thousand, two hundred twenty-one".