1225556749 has 2 divisors, whose sum is σ = 1225556750. Its totient is φ = 1225556748.

The previous prime is 1225556723. The next prime is 1225556851. The reversal of 1225556749 is 9476555221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1118434249 + 107122500 = 33443^2 + 10350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225556749 - 2⁹ = 1225556237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225556699 and 1225556708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225556719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612778374 + 612778375.

It is an arithmetic number, because the mean of its divisors is an integer number (612778375).

Almost surely, 2^1225556749 is an apocalyptic number.

It is an amenable number.

1225556749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225556749 is an equidigital number, since it uses as much as digits as its factorization.

1225556749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756000, while the sum is 46.

The square root of 1225556749 is about 35007.9526536471. The cubic root of 1225556749 is about 1070.1495551866.

The spelling of 1225556749 in words is "one billion, two hundred twenty-five million, five hundred fifty-six thousand, seven hundred forty-nine".