1223955209 has 2 divisors, whose sum is σ = 1223955210. Its totient is φ = 1223955208.

The previous prime is 1223955203. The next prime is 1223955211. The reversal of 1223955209 is 9025593221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1027394809 + 196560400 = 32053^2 + 14020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223955209 - 2⁴ = 1223955193 is a prime.

Together with 1223955211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1223955203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611977604 + 611977605.

It is an arithmetic number, because the mean of its divisors is an integer number (611977605).

Almost surely, 2^1223955209 is an apocalyptic number.

It is an amenable number.

1223955209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223955209 is an equidigital number, since it uses as much as digits as its factorization.

1223955209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 1223955209 is about 34985.0712304549. The cubic root of 1223955209 is about 1069.6831999502.

The spelling of 1223955209 in words is "one billion, two hundred twenty-three million, nine hundred fifty-five thousand, two hundred nine".