3578221 has 2 divisors, whose sum is σ = 3578222. Its totient is φ = 3578220.

The previous prime is 3578209. The next prime is 3578227. The reversal of 3578221 is 1228753.

3578221 = T₁₅₄₃ + T₁₅₄₄ + T₁₅₄₅.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 1590121 = 1410^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 3578221 - 2⁷ = 3578093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3578221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3578227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1789110 + 1789111.

It is an arithmetic number, because the mean of its divisors is an integer number (1789111).

Almost surely, 2^3578221 is an apocalyptic number.

3578221 is the 1545-th centered triangular number.

It is an amenable number.

3578221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3578221 is an equidigital number, since it uses as much as digits as its factorization.

3578221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 3578221 is about 1891.6186190668. The cubic root of 3578221 is about 152.9521971783.

The spelling of 3578221 in words is "three million, five hundred seventy-eight thousand, two hundred twenty-one".