1222555679 has 2 divisors, whose sum is σ = 1222555680. Its totient is φ = 1222555678.

The previous prime is 1222555673. The next prime is 1222555723. The reversal of 1222555679 is 9765552221.

It is an a-pointer prime, because the next prime (1222555723) can be obtained adding 1222555679 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1222555679 - 2⁸ = 1222555423 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222555673) 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, 611277839 + 611277840.

It is an arithmetic number, because the mean of its divisors is an integer number (611277840).

Almost surely, 2^1222555679 is an apocalyptic number.

1222555679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222555679 is an equidigital number, since it uses as much as digits as its factorization.

1222555679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 44.

The square root of 1222555679 is about 34965.0636922057. The cubic root of 1222555679 is about 1069.2753351629.

The spelling of 1222555679 in words is "one billion, two hundred twenty-two million, five hundred fifty-five thousand, six hundred seventy-nine".