1223781679 has 2 divisors, whose sum is σ = 1223781680. Its totient is φ = 1223781678.

The previous prime is 1223781673. The next prime is 1223781707. The reversal of 1223781679 is 9761873221.

It is a weak prime.

It is an emirp because it is prime and its reverse (9761873221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1223781679 - 2¹¹ = 1223779631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223781673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611890839 + 611890840.

It is an arithmetic number, because the mean of its divisors is an integer number (611890840).

Almost surely, 2^1223781679 is an apocalyptic number.

1223781679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223781679 is an equidigital number, since it uses as much as digits as its factorization.

1223781679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 1223781679 is about 34982.5910847095. The cubic root of 1223781679 is about 1069.6326450232.

The spelling of 1223781679 in words is "one billion, two hundred twenty-three million, seven hundred eighty-one thousand, six hundred seventy-nine".