1223979269 has 2 divisors, whose sum is σ = 1223979270. Its totient is φ = 1223979268.

The previous prime is 1223979227. The next prime is 1223979299. The reversal of 1223979269 is 9629793221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 910228900 + 313750369 = 30170^2 + 17713^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223979269 - 2²⁰ = 1222930693 is a prime.

It is a super-2 number, since 2×1223979269² = 2996250501883548722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223979299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611989634 + 611989635.

It is an arithmetic number, because the mean of its divisors is an integer number (611989635).

Almost surely, 2^1223979269 is an apocalyptic number.

It is an amenable number.

1223979269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223979269 is an equidigital number, since it uses as much as digits as its factorization.

1223979269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 1223979269 is about 34985.4150897199. The cubic root of 1223979269 is about 1069.6902090327.

The spelling of 1223979269 in words is "one billion, two hundred twenty-three million, nine hundred seventy-nine thousand, two hundred sixty-nine".