1229309 has 2 divisors, whose sum is σ = 1229310. Its totient is φ = 1229308.

The previous prime is 1229297. The next prime is 1229311. The reversal of 1229309 is 9039221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 41209 = 1090^2 + 203^2 .

It is an emirp because it is prime and its reverse (9039221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1229309 is a prime.

It is a super-2 number, since 2×1229309² = 3022401234962, which contains 22 as substring.

Together with 1229311, 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 (1229329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614654 + 614655.

It is an arithmetic number, because the mean of its divisors is an integer number (614655).

2^1229309 is an apocalyptic number.

It is an amenable number.

1229309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229309 is an equidigital number, since it uses as much as digits as its factorization.

1229309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1229309 is about 1108.7420800168. The cubic root of 1229309 is about 107.1240590936.

The spelling of 1229309 in words is "one million, two hundred twenty-nine thousand, three hundred nine".