1213423243 has 2 divisors, whose sum is σ = 1213423244. Its totient is φ = 1213423242.

The previous prime is 1213423219. The next prime is 1213423247. The reversal of 1213423243 is 3423243121.

It is a strong prime.

It is an emirp because it is prime and its reverse (3423243121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213423243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213423247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606711621 + 606711622.

It is an arithmetic number, because the mean of its divisors is an integer number (606711622).

Almost surely, 2^1213423243 is an apocalyptic number.

1213423243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213423243 is an equidigital number, since it uses as much as digits as its factorization.

1213423243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 25.

The square root of 1213423243 is about 34834.2251672116. The cubic root of 1213423243 is about 1066.6061984059.

Adding to 1213423243 its reverse (3423243121), we get a palindrome (4636666364).

The spelling of 1213423243 in words is "one billion, two hundred thirteen million, four hundred twenty-three thousand, two hundred forty-three".