3556321 has 2 divisors, whose sum is σ = 3556322. Its totient is φ = 3556320.

The previous prime is 3556309. The next prime is 3556331. The reversal of 3556321 is 1236553.

It is a happy number.

3556321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3459600 + 96721 = 1860^2 + 311^2 .

It is an emirp because it is prime and its reverse (1236553) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3556321 - 2¹⁷ = 3425249 is a prime.

It is not a weakly prime, because it can be changed into another prime (3556331) 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, 1778160 + 1778161.

It is an arithmetic number, because the mean of its divisors is an integer number (1778161).

Almost surely, 2^3556321 is an apocalyptic number.

It is an amenable number.

3556321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3556321 is an equidigital number, since it uses as much as digits as its factorization.

3556321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 25.

The square root of 3556321 is about 1885.8210413504. The cubic root of 3556321 is about 152.6395175774.

The spelling of 3556321 in words is "three million, five hundred fifty-six thousand, three hundred twenty-one".