1212419779 has 2 divisors, whose sum is σ = 1212419780. Its totient is φ = 1212419778.

The previous prime is 1212419777. The next prime is 1212419807. The reversal of 1212419779 is 9779142121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212419779 - 2¹ = 1212419777 is a prime.

Together with 1212419777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1212419777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606209889 + 606209890.

It is an arithmetic number, because the mean of its divisors is an integer number (606209890).

Almost surely, 2^1212419779 is an apocalyptic number.

1212419779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212419779 is an equidigital number, since it uses as much as digits as its factorization.

1212419779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 1212419779 is about 34819.8187674778. The cubic root of 1212419779 is about 1066.3121003932.

The spelling of 1212419779 in words is "one billion, two hundred twelve million, four hundred nineteen thousand, seven hundred seventy-nine".