201220309 has 2 divisors, whose sum is σ = 201220310. Its totient is φ = 201220308.

The previous prime is 201220297. The next prime is 201220321. The reversal of 201220309 is 903022102.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (201220297) and next prime (201220321).

It can be written as a sum of positive squares in only one way, i.e., 201214225 + 6084 = 14185^2 + 78^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220309 - 2⁹ = 201219797 is a prime.

It is a super-2 number, since 2×201220309² = 80979225508110962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201220909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610154 + 100610155.

It is an arithmetic number, because the mean of its divisors is an integer number (100610155).

Almost surely, 2^201220309 is an apocalyptic number.

It is an amenable number.

201220309 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220309 is an equidigital number, since it uses as much as digits as its factorization.

201220309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 201220309 is about 14185.2144502648. The cubic root of 201220309 is about 585.9905384674.

The spelling of 201220309 in words is "two hundred one million, two hundred twenty thousand, three hundred nine".