1205054450989 has 2 divisors, whose sum is σ = 1205054450990. Its totient is φ = 1205054450988.

The previous prime is 1205054450947. The next prime is 1205054450993. The reversal of 1205054450989 is 9890544505021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1150138278025 + 54916172964 = 1072445^2 + 234342^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205054450989 - 2²⁵ = 1205020896557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205054450689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602527225494 + 602527225495.

It is an arithmetic number, because the mean of its divisors is an integer number (602527225495).

Almost surely, 2^{1205054450989} is an apocalyptic number.

It is an amenable number.

1205054450989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205054450989 is an equidigital number, since it uses as much as digits as its factorization.

1205054450989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 52.

The spelling of 1205054450989 in words is "one trillion, two hundred five billion, fifty-four million, four hundred fifty thousand, nine hundred eighty-nine".