1220001779 has 2 divisors, whose sum is σ = 1220001780. Its totient is φ = 1220001778.

The previous prime is 1220001763. The next prime is 1220001803. The reversal of 1220001779 is 9771000221.

It is a weak prime.

It is an emirp because it is prime and its reverse (9771000221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220001779 - 2⁴ = 1220001763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220000779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610000889 + 610000890.

It is an arithmetic number, because the mean of its divisors is an integer number (610000890).

Almost surely, 2^1220001779 is an apocalyptic number.

1220001779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220001779 is an equidigital number, since it uses as much as digits as its factorization.

1220001779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 1220001779 is about 34928.5238594476. The cubic root of 1220001779 is about 1068.5302495241.

The spelling of 1220001779 in words is "one billion, two hundred twenty million, one thousand, seven hundred seventy-nine".