6165221 has 2 divisors, whose sum is σ = 6165222. Its totient is φ = 6165220.

The previous prime is 6165217. The next prime is 6165227. The reversal of 6165221 is 1225616.

6165221 is digitally balanced in base 3, 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., 3556996 + 2608225 = 1886^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 6165221 - 2² = 6165217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6165227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3082610 + 3082611.

It is an arithmetic number, because the mean of its divisors is an integer number (3082611).

Almost surely, 2^6165221 is an apocalyptic number.

It is an amenable number.

6165221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6165221 is an equidigital number, since it uses as much as digits as its factorization.

6165221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 6165221 is about 2482.9863068491. The cubic root of 6165221 is about 183.3649043885.

The spelling of 6165221 in words is "six million, one hundred sixty-five thousand, two hundred twenty-one".