1223016209 has 2 divisors, whose sum is σ = 1223016210. Its totient is φ = 1223016208.

The previous prime is 1223016199. The next prime is 1223016211. The reversal of 1223016209 is 9026103221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1146838225 + 76177984 = 33865^2 + 8728^2 .

It is an emirp because it is prime and its reverse (9026103221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1223016209 - 2⁸ = 1223015953 is a prime.

It is a Sophie Germain prime.

Together with 1223016211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1223016259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611508104 + 611508105.

It is an arithmetic number, because the mean of its divisors is an integer number (611508105).

Almost surely, 2^1223016209 is an apocalyptic number.

It is an amenable number.

1223016209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223016209 is an equidigital number, since it uses as much as digits as its factorization.

1223016209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1223016209 is about 34971.6486457244. The cubic root of 1223016209 is about 1069.4095816868.

The spelling of 1223016209 in words is "one billion, two hundred twenty-three million, sixteen thousand, two hundred nine".