1225405549 has 2 divisors, whose sum is σ = 1225405550. Its totient is φ = 1225405548.

The previous prime is 1225405507. The next prime is 1225405607. The reversal of 1225405549 is 9455045221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197506025 + 27899524 = 34605^2 + 5282^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225405549 - 2⁹ = 1225405037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225400549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612702774 + 612702775.

It is an arithmetic number, because the mean of its divisors is an integer number (612702775).

Almost surely, 2^1225405549 is an apocalyptic number.

It is an amenable number.

1225405549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225405549 is an equidigital number, since it uses as much as digits as its factorization.

1225405549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 1225405549 is about 35005.7930777179. The cubic root of 1225405549 is about 1070.1055443680.

The spelling of 1225405549 in words is "one billion, two hundred twenty-five million, four hundred five thousand, five hundred forty-nine".