3509221 has 2 divisors, whose sum is σ = 3509222. Its totient is φ = 3509220.

The previous prime is 3509153. The next prime is 3509251. The reversal of 3509221 is 1229053.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3496900 + 12321 = 1870^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 3509221 - 2⁹ = 3508709 is a prime.

It is a Chen prime.

It is equal to p₂₅₀₇₄₄ and since 3509221 and 250744 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 3509192 and 3509201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3509251) 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, 1754610 + 1754611.

It is an arithmetic number, because the mean of its divisors is an integer number (1754611).

Almost surely, 2^3509221 is an apocalyptic number.

It is an amenable number.

3509221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3509221 is an equidigital number, since it uses as much as digits as its factorization.

3509221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 3509221 is about 1873.2914882634. The cubic root of 3509221 is about 151.9626668469.

The spelling of 3509221 in words is "three million, five hundred nine thousand, two hundred twenty-one".