1223309 has 2 divisors, whose sum is σ = 1223310. Its totient is φ = 1223308.

The previous prime is 1223281. The next prime is 1223311. The reversal of 1223309 is 9033221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 162409 = 1030^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223309 - 2¹² = 1219213 is a prime.

Together with 1223311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611654 + 611655.

It is an arithmetic number, because the mean of its divisors is an integer number (611655).

2^1223309 is an apocalyptic number.

It is an amenable number.

1223309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223309 is an equidigital number, since it uses as much as digits as its factorization.

1223309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1223309 is about 1106.0330013160. The cubic root of 1223309 is about 106.9494914030.

The spelling of 1223309 in words is "one million, two hundred twenty-three thousand, three hundred nine".