1213223939 has 2 divisors, whose sum is σ = 1213223940. Its totient is φ = 1213223938.

The previous prime is 1213223933. The next prime is 1213223959. The reversal of 1213223939 is 9393223121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9393223121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213223939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213223899 and 1213223908.

It is not a weakly prime, because it can be changed into another prime (1213223933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606611969 + 606611970.

It is an arithmetic number, because the mean of its divisors is an integer number (606611970).

Almost surely, 2^1213223939 is an apocalyptic number.

1213223939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213223939 is an equidigital number, since it uses as much as digits as its factorization.

1213223939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 35.

The square root of 1213223939 is about 34831.3643000098. The cubic root of 1213223939 is about 1066.5477987440.

The spelling of 1213223939 in words is "one billion, two hundred thirteen million, two hundred twenty-three thousand, nine hundred thirty-nine".