1222716779 has 2 divisors, whose sum is σ = 1222716780. Its totient is φ = 1222716778.

The previous prime is 1222716749. The next prime is 1222716793. The reversal of 1222716779 is 9776172221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222716779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222716749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611358389 + 611358390.

It is an arithmetic number, because the mean of its divisors is an integer number (611358390).

Almost surely, 2^1222716779 is an apocalyptic number.

1222716779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222716779 is an equidigital number, since it uses as much as digits as its factorization.

1222716779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 1222716779 is about 34967.3673444256. The cubic root of 1222716779 is about 1069.3223003560.

The spelling of 1222716779 in words is "one billion, two hundred twenty-two million, seven hundred sixteen thousand, seven hundred seventy-nine".