1222547779 has 2 divisors, whose sum is σ = 1222547780. Its totient is φ = 1222547778.

The previous prime is 1222547737. The next prime is 1222547797. The reversal of 1222547779 is 9777452221.

Together with next prime (1222547797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9777452221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222547779 - 2¹³ = 1222539587 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222547719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611273889 + 611273890.

It is an arithmetic number, because the mean of its divisors is an integer number (611273890).

Almost surely, 2^1222547779 is an apocalyptic number.

1222547779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222547779 is an equidigital number, since it uses as much as digits as its factorization.

1222547779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 46.

The square root of 1222547779 is about 34964.9507221160. The cubic root of 1222547779 is about 1069.2730319840.

The spelling of 1222547779 in words is "one billion, two hundred twenty-two million, five hundred forty-seven thousand, seven hundred seventy-nine".