222220309 has 2 divisors, whose sum is σ = 222220310. Its totient is φ = 222220308.

The previous prime is 222220291. The next prime is 222220331. The reversal of 222220309 is 903022222.

222220309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (222220331) can be obtained adding 222220309 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220522500 + 1697809 = 14850^2 + 1303^2 .

It is a cyclic number.

It is not a de Polignac number, because 222220309 - 2¹⁵ = 222187541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222220309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222220109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110154 + 111110155.

It is an arithmetic number, because the mean of its divisors is an integer number (111110155).

Almost surely, 2^222220309 is an apocalyptic number.

It is an amenable number.

222220309 is a deficient number, since it is larger than the sum of its proper divisors (1).

222220309 is an equidigital number, since it uses as much as digits as its factorization.

222220309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 222220309 is about 14907.0556784363. The cubic root of 222220309 is about 605.7051259946.

The spelling of 222220309 in words is "two hundred twenty-two million, two hundred twenty thousand, three hundred nine".