3221917 has 2 divisors, whose sum is σ = 3221918. Its totient is φ = 3221916.

The previous prime is 3221899. The next prime is 3221941. The reversal of 3221917 is 7191223.

3221917 is digitally balanced in base 2, 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., 3218436 + 3481 = 1794^2 + 59^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3221917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3221891 and 3221900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221957) 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, 1610958 + 1610959.

It is an arithmetic number, because the mean of its divisors is an integer number (1610959).

Almost surely, 2^3221917 is an apocalyptic number.

It is an amenable number.

3221917 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221917 is an equidigital number, since it uses as much as digits as its factorization.

3221917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 3221917 is about 1794.9699161824. The cubic root of 3221917 is about 147.6969236073.

The spelling of 3221917 in words is "three million, two hundred twenty-one thousand, nine hundred seventeen".