3220661 has 2 divisors, whose sum is σ = 3220662. Its totient is φ = 3220660.

The previous prime is 3220639. The next prime is 3220663. The reversal of 3220661 is 1660223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2739025 + 481636 = 1655^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220661 - 2⁶ = 3220597 is a prime.

Together with 3220663, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₂₃₁₆₁₇ and since 3220661 and 231617 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3220663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610330 + 1610331.

It is an arithmetic number, because the mean of its divisors is an integer number (1610331).

Almost surely, 2^3220661 is an apocalyptic number.

It is an amenable number.

3220661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220661 is an equidigital number, since it uses as much as digits as its factorization.

3220661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3220661 is about 1794.6200154907. The cubic root of 3220661 is about 147.6777288809.

Adding to 3220661 its reverse (1660223), we get a palindrome (4880884).

The spelling of 3220661 in words is "three million, two hundred twenty thousand, six hundred sixty-one".