1225444445209 has 2 divisors, whose sum is σ = 1225444445210. Its totient is φ = 1225444445208.

The previous prime is 1225444445207. The next prime is 1225444445221. The reversal of 1225444445209 is 9025444445221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1225331660809 + 112784400 = 1106947^2 + 10620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225444445209 - 2¹ = 1225444445207 is a prime.

Together with 1225444445207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1225444445207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612722222604 + 612722222605.

It is an arithmetic number, because the mean of its divisors is an integer number (612722222605).

Almost surely, 2^{1225444445209} is an apocalyptic number.

It is an amenable number.

1225444445209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225444445209 is an equidigital number, since it uses as much as digits as its factorization.

1225444445209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1843200, while the sum is 46.

It can be divided in two parts, 122544 and 4445209, that added together give a triangular number (4567753 = T₃₀₂₂).

The spelling of 1225444445209 in words is "one trillion, two hundred twenty-five billion, four hundred forty-four million, four hundred forty-five thousand, two hundred nine".