1223556679 has 4 divisors (see below), whose sum is σ = 1225069920. Its totient is φ = 1222043440.

The previous prime is 1223556667. The next prime is 1223556683. The reversal of 1223556679 is 9766553221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1223556679 - 2⁵ = 1223556647 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223556619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755407 + ... + 757024.

It is an arithmetic number, because the mean of its divisors is an integer number (306267480).

Almost surely, 2^1223556679 is an apocalyptic number.

1223556679 is a deficient number, since it is larger than the sum of its proper divisors (1513241).

1223556679 is an equidigital number, since it uses as much as digits as its factorization.

1223556679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513240.

The product of its digits is 680400, while the sum is 46.

The square root of 1223556679 is about 34979.3750515929. The cubic root of 1223556679 is about 1069.5670880969.

The spelling of 1223556679 in words is "one billion, two hundred twenty-three million, five hundred fifty-six thousand, six hundred seventy-nine".